Hi,
I don't think it is 'the' document, but rather 'a' document. Remember, approved patents needed to be distributed throughout the country, also several copies needed to be stored for future reference.
The Swiss have digitized most (if not all) of their patent documents and this may mean that part of the documentation is being disposed of.
Amtsexemplar probably only means that it was government property. Nothing more, nothing less.
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