Terms for subject Mathematics containing до ... года

Russian	English
до ... года	prior to 1943, heavy water was produced by electrolysis of water
до ... года	before 1948, transistors were unknown
за год до	a year ahead of
с середины ... годов до начала ... годов	strain gauges started глагол только в прошедшем времени to be used in the mid 1950s to early 1960s