1939 Having arrived in the UK in 1937, Joe Erlich was, by now, testing a machine that was fitted with his 240cc twin-piston, split single, two-stroke engine.
1941 The Stewart-Ehrlich concern offered a machine to the War Department for testing. This was refused, but on 15th October 1941 they tested a version with a larger engine. The military did not place an order, but development of the machines continued. 
1947 After World War II Erlich built a 345cc machine with Dowty Oleomatic front forks and a rigid frame.
1951 Erlich built a road racing model fitted with a 125cc Austrian Puch engine.
1958 Joined De Haviland where he further developed the EMC racers which were campaigned by Phil Read (12th 125cc 1961), Mike Hailwood (5th 125cc 1961) and Paddy Driver (10th 125cc 1962). Left De Haviland in 1968.
1972 A 650cc two-stroke triple was built which delivered 102hp. The engine for this was used in snowmobiles in the US. 
1. Stewart-Ehrlich is mentioned only briefly in the BFM book. There is a remote possibility that this is Col. Neil Stewart of Trump-JAP, one of the husbands of Gwenda.
2. Wikipedia NL.
Sources: Graces Guide, British Forces Motorcycles.
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