1935 and in 1953, greater proof of competence was reintroduced (Großer Befähigungsnachweis Kuhlenbeck), which required craftspeople to obtain a Meister apprentice-training...

Certificate of Competency – the historical truth (Handwerksordnung und großer Befähigungsnachweis – die historische Wahrheit), Chamber of Crafts and Trade Lüneburg...

for the Luftwaffe had first to make a testpiece or masterpiece (Befahigungsnachweis) to prove their competence and the Hs 121 was Henschel's offering...