|VOOMP logo and very early GOMZ logo on Fotokor-1|
image by Süleyman Demir (Image rights)
VOOMP was an union of Soviet camera and mechanical factories in Leningrad.
In 1929 the Council of Labour and Defence of the USSR decided to join all optical and mechanical factories of the era under the same name, "Union Trust opto-mechanical enterprises" (VTOMP), (= Всесоюзный Трест Оптико-Механических предприятий ВТОМП).
In 1930 VTOMP name changed as the Union of Optico-Mechanical Companies (VOOMP), (=Всесоюзное объединение оптико-механической промышленности, ВООМП).
In 1932 the company was renamed again as "State Optical Mechanical Plant (GOMZ).
In the transition times, VOOMP and very early GOMZ logos are seen together on the Fotokor-1 cameras.