[Alt-photo] Poitevin 1855

Alberto Novo alt.list at albertonovo.it
Fri Sep 23 07:08:10 UTC 2016


> Here is the British patent I found once in a book. Never could find the 
> French one which does have some variation apparently

Thank you so much, Peter!
May you also give me the full citation (author(s), title, publisher, year, pages)?

Alberto


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