An engine builder that has not emerged too much but has a range of engines as below, and whose documentation has been requested from the Nasm: Possibly it is Kemp.

-G-2 engine with two opposed cylinders. Doc. (BK-200040-01). Fot. (BK-200040-20).

-H-6 six-cylinder in line engine, Fot. (BK-200100-20).

-I-4 engine with four cylinders in line. Fot. (BK-200150-20).

-J-8, an 8-cylinder Vee-engine. Fot. (BK-200200-20).

-M-2 engine with two opposed cylinders. Fot. (BK-200300-20).

Author's note: It seems that it is Kemp-Gray Eagle, but at the NASM it appears as Kemo-Gray Eagle.