CH 4f

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The Swiss patent category system of the time had a class 4 for Constructions au-dessus du sol, and a subclass 4f for Bâtisses de tous genres.

This wiki has 1 patents in category "CH 4f".

Patents in category CH 4f

Enclosing categories Swiss patent classifications, 1908-1920
Subcategories
Keywords Infrastructure, Hangars
Start year 1890
End year 1907