Hello Stig,
the original “Luftfahrzeugrolle-B“ (LFR-B) is missing. In the February 1928 issue of the bulletin “Nachrichten für Luftfahrer“ (NfL) all registered aircraft of the “Luftfahrzeugrolle-B“ (LFR-B) were listed. From then on all new registrations and changes were published in the NfL. A complete work of the LFR-B was never published. You can find details in the website of the “Arbeitsgemeinschaft Deutsche Luftfahrthistorik“ (ADL)
www.adl-luftfahrthistorik.de.
The book “Recherchen zur Deutschen Luftfahrzeugrolle 1919-1934“ (Investigations on the German Aircraft Register 1919-1934) is a reconstruction of the LFR-B and the NfL. There are the research results of Dr. Ernst Vocke, published in 1977 by Karl Ries without permission of Dr. Vocke. In this book 24 He HD 42 are listed:
D-1793 WNr. 333 registration February 1930.
He 42 b
D-2032 – D-2035, WNr. 372-375 registration April 1931
He 42 C
D-2346 WNr. 419
D-2351 WNr. 420
D-2353 WNr. 421
D-2354 WNr. 422
D-2370 WNr. 428, all registered October 1932
He 42 D
D-2543 – D-2556, WNr. 443-456, registered from July 1933 – October 1933.
Regards
Leo