sentences:  It passed its State acceptance tests in the autumn of 1942, but was not placed into production as there was not any production capacity available, although it was tested on a number of different prototypes during the war.The M-72 of early 1945 was a boosted version of the M-71 and was superseded by the ASh-73 before production could get underway.The first prototypes of the ASh-73 were built in 1945 and by the end of 1946 testing had completed successfully.