[Alt-photo] Poitevin 1855

Alberto Novo alt.list at albertonovo.it
Fri Sep 23 08:47:56 UTC 2016

>     I've lost track of what this is about but this patent relevant?
> USP 36,821

This is a lightly different process: it is for obtaining copies of the gelatin relief.
Maybe Woodbury took inspiration from this.


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