It sure is the Musee des Arts et Metiers Anzaniste

,,,,,,,,,,, a cracking place to visit , joint third on
my top five of industrial /technology museum's .
I wonder when the milling machine was invented?
Good question and hard to say , it looks like it was invented around the early to mid 1700s by a French man working in the clock making industry . Rees's Manufacturing industry 1819 -20 makes no mention of the milling machine(rotary filing machine) ,and there is also no mention of the milling machine in my 1833 copy of Manufactures in Metal , so it looks like it was still in it infancy as a machine tool at that time as lathes ,boring and other machinery are well documented .Although the milling machine was being developed by several engineers on two continents at around the same time .
The first milling machine manufactured for sale was produced in the USA , designed by a Mr Frederick Webster Howe in 1848 for the Robbins and Lawrence Company ,Windsor,Vermont .

Joe if you reading this it is probably down to Mr Frederick Webster Howe that you have weird threads on your rifle parts

(still looking )

Rob