Toronto. Post war, the Elmar went to the DOOGS. The little camera mounted collapsible Elmar was redesigned as a reproduction and enlarging lens in a much more practical lens mount and the elements were coated to reduce the internal reflections.
The DOOGS used an extension ring called a DOORX to extend the lens the correct distance for the enlarger. The lens and ring combination was coded as a DOOIT. Without that ring the lens was used as a reproduction lens. The design was a short lived (1951-1953) bridge from the VAROB and little collapsible Elmars to the FOCOTAR, the professional enlarging lens made by Leitz.
I bought my lens in August of 1986 from Roger Pelham. It was an early version made in 1951. I tracked down the DOORX extension tube locally much earlier in February of 1979 at Henrys downtown when they had imported and were selling off a whack of stuff they bought from a Chicago store.