Arbeitsbuch - Berlin / Frankfurt engineer, weapons production

2nd edition Arbeitsbuch issued to Gerhard Ett in early October 1937. He was born in March 1902 and was from Eisenach. The stamps and entries indicate that he worked as an engineer or technician (Betriebs Ing.). He worked for a “weapons and munitions” manufacturer (Deutsche Waffen un Munitionsfabriken A.G. Berlin Brosigwalde) in Berlin from Oct 1937 to March 1938. He then worked for several firms in Frankfurt am Main until at least mid-1941, he appears to have been manufacturing metal parts / components.