MAT
Built in the years 1929 to 1932, the MAT was a shaft-drive four-cylinder sidevalve machine built by Bugatti racer Milos Bondy.
Designed by Františka Votroubek (previously with Walter) and Jaroslav Šlechtu, this had a very compact inline four cylinder engine of 485 cc.
The MAT received approval in 1931, and some 20 to 25 were built before production ceased in 1932.
Source: Tragatsch p202, François-Marie Dumas
Dumas has written an excellent article on the machine with several clear illustrations. He goes to some length explaining why the engine has the appearance of a square four, but is in fact a far from conventional inline four.
MB
Built in the Avia factory of Milos Bondy. The 498cc engine, designed by Jaroslav Šlechtu, had a rotary valve head similar to the Soyer face-cam design. It did not achieve production and was replaced by another Bondy marque, the MAT.
Avia manufactured aeroplanes under license from Hispano-Suiza prior to WWII, and in the 1970s Bondy built Saviem trucks under license.
Sources: Tragatsch p205; Graham Clayton
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