DE 77d

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From the Swedish patent's office's "Introduction to the German Patent Classification (DPK)" online:[1]

The German Patent Office started developing a classification system for its patent documents in 1877. It was published in seven editions between 1906 and 1958, first as "Verzeichnis der deutschen Patentklassen" and later as "Gruppeneinteilung der Patentklassen". Between the editions, modifications were published in the form of "Änderungen" and "Ergänzungslieferungen".

The subsets of the German classes are listed in English on the Swedish site here, and in particular class 77's subsets, linked from that page, are listed here. In that context, DE 77d covers the category of "Games." We don't know for certain that the meaning of DE 77d was the same at the time early aero.

References

This wiki has 0 patents in category "DE 77d". Other techtypes related to DE 77d: AT 77d


Enclosing categories DE 77
Subcategories
Keywords games
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