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The département français is the key French administrative unit featured on original French patent documents. It is often the only location data given, for inventors located in France. Nations are usually all the data given for inventors located outside of France while filing with the French patent office. Hungarian data, when available, is quite reliable in terms of giving us the city. British data, when available, will almost always give us the most precise address data. It is rare to have the “département” mentioned on non-French patents, though Britain does this from time to time. These data are cross-referenced depending on the order in which we find the variously national patents filed by the inventors in question.

The départemental and any other locational situation any particular inventor may change over time, and no particular key city should replace départemental data, but be added, and tracked, in its variance from patent to patent.

“Département”, as applied to French colonial possessions, may lead to some ambiguity in terms of the administrative protocols.

The région française is another, and greater, specific and official French administrative unit, also not to be confused with English region as we may use the word more generally. This will may become more pertinent as we home in on geographical data in the context of the social network analysis, or otherwise.

There were and are many others of course. These have been entered as they arise from our perusal of original patent documents, with various particulars being verified via French Wikipedia.