DE 42
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In 1900, a list of the main categories (no additional letters or groups) defined Klasse 42 as "Instrumente". This category definitely includes photography and optics. It includes at least incidentally some patents related to mapping.
AT 42 is a certain correlate, though it may have been subdivided differently as time went on.
| Enclosing categories | German patent classifications, German patent classifications 1877 |
|---|---|
| Subcategories | DE 42n |
| Keywords | Photography, Instrument, Map |
| Start year | |
| End year |
