hydraulic; pneumatic

Full Title

Order telegraph apparatus, i.e. means for transmitting one of a finite number of different orders at the discretion of the user, e.g. bridge to engine room orders in ships > hydraulic; pneumatic

Child Classifications

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• G08B 9/16 using ratchet
• G08B 9/18 by varying displacement of the fluid
• G08B 9/20 by varying pressure of the fluid