DIFF Subgroup
G08B 9/20 by varying pressure of the fluid
Introduced: September 1968
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 > by varying pressure of the fluid
No child classifications to compare. This is a leaf node in both IPC and CPC.