Numbers on the bottoms of glass bottles and jars Numbers digits embossed on the bottoms of glass bottles and jars. I frequently receive inquiries about what these number markings mean. Always look very closely over the entire glass bottle or other container to make sure there is not some type of logo emblem, trademark, initials, or just a letter that might indicate the actual glass manufacturer. In many cases there is NO such mark, with only a number or numbers to be seen. In these cases, the general style, shape, glass color and other characteristics may help narrow down the possible age range of a particular specimen. If problems occur with the finished product, it can be easily ascertained which mold or mold section is at fault. Some numbers for instance, 3- or 4-digit numbers on the base of many British bottles are catalog, inventory, style or design numbers assigned to a particular bottle shape. Search google with that phrase for a webpage that lists many of the permit numbers assigned and used by many glass companies.
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Elgin National Watch Company In the spring of half a dozen ambitious Chicago businessmen decided that if Massachusetts could build a factory that built watches – Illinois could, too. Harper’s magazine summed their sentiment perfectly: “It was the genuine, audacious, self-reliant Western spirit.”.
Click here to view additional historical photos of the Waltham factory. Their vision was to form a watch company that could produce high-quality watches at a lower cost using interchangeable parts. With financial backing from Samuel Curtis, of small-arms manufacturing fame, the watch production began in , and the first small group of watches were finished in late The first watches produced went to officials of the company, and it was not until that the first watches were offered for sale to the public.
Problems were encountered with the new production methods. The company was exploring innovative new ideas in watch manufacturing, such as using jewels, making enamel dials, and producing plates with a high-level of finish which required extensive tooling and resulted in a great financial burden. They also found that even though they were using interchangeable parts, each watch was still unique and had its own set of errors to be corrected. It took months to adjust the watches to the point where they were any better than other widely available timepieces.
Customer Department at the Waltham Watch Company In , the factory building was completed and the company began doing business under the name “American Horologe Company. In , as Abraham Lincoln was elected President and the country found itself in the throes of the Civil War, the American Watch Company was faced with serious financial problems. By , business had come to a standstill and bankruptcy seemed inevitable.
Frequently one finds that sellers guess-timate the age of a piece to show the item in its most favorable light. Weekend collectors–in a post-brunch glow and accompanied by a charming companion–are all too ready to hear the best of an object that has attracted their attention. As we say on the Street: That’s what makes a trade.
Dating uk patent numbers. is a patent date after which any for the uk intellectual property office and date of u. Advanced patent numbers of successful u. How of the u. Advanced patent number, when an item was registered. How of british inventors; some inventors; some inventors are from the grant of april , return patents.
Originally they were not an item issued to every officer but were kept for special operations and situations. These early whistles are not identifiable as they did not have any special markings. They would have been round pea and Beaufort whistles; the latter is a conical shape. From the s some forces began to equip all officers. The Metropolitan Police issued a few whistles in but they were little used. However, when used they proved to be ideal. Manchester City Police was supplied with the GSW in the early s and one of their whistles was employed later in tests by the Metropolitan Police when they were investigating the feasibility of replacing the rattle with the whistle.
Part of their investigations included asking the views of twenty constables each with a considerable length of service. Fifteen preferred the whistle as the rattle was seldom used, being cumbersome and awkward to get out of the pocket. A regulation rattle competed against a Manchester City Police whistle. The official tests showed that the rattle could be heard faintly at yards and not at all at yards.
The whistle could be clearly heard at yards but was ill-defined at yards. The Metropolitan Police decided to go ahead and advertisments were placed in the press inviting whistle manufacturers to submit models. The various whistles submitted were tested on Clapham Common and one of the patterns sent by Hudsons, similar to the Manchester City Police whistle, was chosen.
Click on the pictures to enlarge them Avro Lancaster throttle quadrant pg1 cont Here we have a complete original Lancaster throttle quadrant in superb condition Avro type Serial number AL In the fifteen years I have been collecting this is the only one I have ever seen. To my knowledge there are only ten or so of these left in existence world wide. All the levers are free and operate as they should.
Any Rolls razor without a Greek key design is a rarer “early” razor. In prime, unused condition, gold- or silver-plated sets could be worth twice what they sold for at retail. In prime, unused condition, gold- or silver-plated sets could be worth twice what they sold for at retail.
The picture below at the left shows an iron pontil on the base jof a historical flask circa The middle picture shows an open pontil on the base of a cylindrical medicine bottle. The third picture shows the base of a milk bottle from just after the trun of the century. The disk-like mark is sometimes confused with a pontil. Close up of iron pontil Close up of an open pontil milk base for comparison A Close Look at the Owens Ring Beginning collectors often confuse an Owen’s ring with a pontil mark and it is easy to see why this happens.
The pictures below are from two early machine made medicine bottles. I have put up pictures of the lips so that the readers can see how they mold goes all the way over the top as shown below.
There are a number of methods by which a rifle can be dated, or at least bracketed between certain years of manufacture. For the latter, dates of introduction of military arms can be located within the Government “List of Changes” LoCs as can dates of obsolescence and of modification or upgrade to later marks. You may not necessarily find specific date information within the text of particular pages, but often the images of advertisements or catalogue entries contain some dating ‘give-away’, such as the year in which a particular rifle achieved a notable competition score by someone, but which data is in graphic format and therefore not “searchable” by a text search engine.
Do not briefly glance over a page and assume that the information you require is not there. It may not be immediately obvious, but careful observation may provide you with the information for which you are looking. Such research is a major part of the joy of owning, collecting and shooting classic or historic rifles.
The Manual of Patent Practice (MOPP) explains the Intellectual Property Office’s practice under the Patents Act
Dating “Pre Coded” Zippos – This era presents the most difficult lighters to date. Whilst the base stamps my look similar there are a number of differences to observe. There appears to be some overlap between the base stamps used on these lighters. In researching this page I am indebted to many other collectors who have sent me photographs of lighters in their collections that were factory engraved with a date.
By looking at factory dated lighters we can make some assumptions that that the lighter was made either in that particular year or maybe the year before. All the information on this page has been obtained from a study of these dated lighters. I am sure that there are other base stamps out there that I have yet to see, and I have little doubt that there are factory dated lighters that do not fit the years I have shown.
If you do have a lighter that does not match my guide please let me know and I will update the information. Much research remains to be done and this page will be updated as this research continues. Should you have any information that may help other collectors, please do not hesitate to contact me. Email Lighters made in early have a case made from Nickel-silver.
These cases can have a tendency to look yellow and are non magnetic. There will be no chrome plating on the case.
Effects[ edit ] A patent does not give a right to make or use or sell an invention. From an economic and practical standpoint however, a patent is better and perhaps more precisely regarded as conferring upon its proprietor “a right to try to exclude by asserting the patent in court”, for many granted patents turn out to be invalid once their proprietors attempt to assert them in court. Like any other property right, it may be sold, licensed, mortgaged , assigned or transferred, given away, or simply abandoned.
A patent, being an exclusionary right, does not necessarily give the patent owner the right to exploit the invention subject to the patent. For example, many inventions are improvements of prior inventions that may still be covered by someone else’s patent. Some countries have “working provisions” that require the invention be exploited in the jurisdiction it covers.
Singer Serial Numbers: The list starts with the USA made , then the UK made K, and finally the UK made K. For a complete production record file format of all available Singer machines by the serial number prefix, please look towards the bottom LEFT side of this webpage for the prefix file you need, then click on the tab to.
History[ edit ] Carbon tetrachloride CCl4 was used in fire extinguishers and glass “anti-fire grenades” from the late nineteenth century until around the end of World War II. Experimentation with chloroalkanes for fire suppression on military aircraft began at least as early as the s. Freon is a trade name for a group of CFCs which are used primarily as refrigerants , but also have uses in fire-fighting and as propellants in aerosol cans.
Bromomethane is widely used as a fumigant. Dichloromethane is a versatile industrial solvent. In the late s, Thomas Midgley, Jr. In searching for a new refrigerant, requirements for the compound were: In a demonstration for the American Chemical Society , Midgley flamboyantly demonstrated all these properties by inhaling a breath of the gas and using it to blow out a candle  in Nevertheless, after the war they slowly became more common in civil aviation as well.
In the s, fluoroalkanes and bromofluoroalkanes became available and were quickly recognized as being highly effective fire-fighting materials.
This section contains content that is written like an advertisement. Please help improve it by removing promotional content and inappropriate external links , and by adding encyclopedic content written from a neutral point of view. October Learn how and when to remove this template message BT’s origins date back to the establishment of the first telecommunications companies in Britain. Among them was the first commercial telegraph service , the Electric Telegraph Company , established in
42MB Lend Lease with Sentencing Marks. A question was asked as to the reason for the paint daubs, here is the answer: The daubs are sentencing marks indicating that it was examined and found wanting for something but it was good enough to store pending repair. It could be as simple as a missing sight or it does not have the latest upgrade.
The “A” stands for “Ajustable truss rod. A new series of numbers was started in February, What years was the flower pot headstock inlay available on the Tubaphone style 3, 5 string banjo? Roughly to , the last serial number seen was Fairbanks plate to F-V stamp to Vega stamp? Although there are no absolutes where Vega is concerned, several years of research have led me to these conclusions about when certain changes were made see Fairbanks Research article for data: The Fairbanks Electric tone ring, was introduced in ; the earliest reported is serial The earliest reported Whyte Laydie which is the Electric tone ring with the addition of the bracket band is The earliest reported Tubaphone is Double stamped Tubaphones with earlier numbers are WL’s that were returned to the factory for retro-fitting.
The crossover on WL 2s happens between and Earlier WL 2s with notched stretcher bands probably were retro-fitted. WL 7s and one TU 9 continued to have grooved stretcher bands and cobra hooks until at least