"Czeskoslovenska Zabody Letecke" grouped the country's aeronautics industry, although commercialization was taken care of by "Omnipol".

"Mikron III"

-They built Walter's Mikron engines, the III and the Minor 4-III giving 65 and 105 CV respectively.

"Minor 4-III"

-Also included were the Walter inverted in-line 6-cylinder 6-III engines and their derivatives, the M-332 and the M-337.

"Walter 6-III"

"Walter 6-III"

"M-332, supercharged"

"M-337"

-These Walter engines are distinguished by their inverted in-line cylinder arrangement.

-That is why it is strange to see the 105-hp CZL M-110 engine installed on the Czechoslovakian HC-2 helicopter.

"Praga - Doris"

-With six opposed horizontal cylinders and OHC, it is the Prague-Doris B, 220 HP which happens to be one of the most beautiful engines of this arrangement.