with pneumatic drive or displacement and speed control or stopping by hydraulic braking

Full Title

Servomotor systems without provision for follow-up action; (F15B3/00 takes precedence) > involving features specific to the use of a compressible medium, e.g. air, steam > Combined pneumatic-hydraulic systems (F15B11/032 takes precedence) > with pneumatic drive or displacement and speed control or stopping by hydraulic braking