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не требующий обслуживания stresses
auto.	no-maintenance
math.	maintenance-free (system, etc.)
oil	maintenance-free; off-hand
qual.cont.	off-hand (напр., о станке)
seism.	off-hand (напр., об установке)
не требующий технического обслуживания
qual.cont.	service-free

не требующий обслуживания: 29 phrases in 13 subjects

Astronautics	1
Automated equipment	4
Automobiles	1
Aviation	1
Construction	1
Medical	2
Military	4
Nuclear and fusion power	1
Oil / petroleum	4
Oil and gas	2
Quality control and standards	4
Solar power	1
Technology	3