
To complete the figure credits I need a patent reference for the drawing of the Fichet 7 lever push-key lock at
http://www.chez.com/montmartre/fichetronde.html
which has got to be from a patent, but which patent is it from? At the bottom of the picture it says "Etude JLM/SER/Paracini Feb 1962". I cannot find this on esp@cenet despite several searches.
I will acknowldge in the book anyone who helps me to identify the source of this drawing or an equivalent lock patent.