Patent dating guide


Unfortunately I do not have the time or the money to build up a collection that will allow me to make the comparisons seen on the rest of the dating pages.There is however a Japanese collector, who like me, loves attention to detail, and has produced an excellent descriptive work on lighters from this era the English version of which is here When America entered the Second World War, many materials were restricted to military use.published by Click Parade magazine in the US in 1938 and recently resurfaced online, includes a string of warnings modern girls would baulk at; from minimising their alcohol intake to always looking interested - even if their date's chat is less than scintillating.

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Because of wear it is often difficult to see which number is stamped, so the # symbol before the patent number is sometimes the only way to tell.Each patent document describes a new aspect of a technology in clear and specific terms and is available for anyone to read.This makes them vital resources for businesses, researchers, academics and others who need to keep up with developments in their fields.Firstly, it is porous and secondly it is susceptible to rust.


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