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позиционная следящая система stresses
automat.	position control servomechanism; position control servosystem; position servomechanism duplication; positioning servosystem
met.	position control system
robot.	position servosystem; position-based servo
tech.	positional servosystem; position servo; position-control servomechanism; positional servo system; positional servo

позиционная следящая система: 7 phrases in 3 subjects

Astronautics	1
Automated equipment	3
Robotics	3