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главный механизм stresses
Makarov.	escapement mechanism (пишущей машины)
phys.chem.	prominent mechanism (igisheva)
tech.	main machine (Andrey Truhachev)
главные механизмы
Makarov.	propelling power
mil.	main engines (Киселев)
nautic.	main propulsion machinery plant; main machinery; propulsive machinery; propelling machinery; main propulsion machinery
shipb.	main power; main propelling machinery
tech.	propulsion machinery

главный механизм: 25 phrases in 5 subjects

Makarov	1
Military	2
Nautical	15
Shipbuilding	5
Technology	2