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Class Information
Number: 137/552.5
Name: Fluid handling > With indicator, register, recorder, alarm or inspection means > Plural > Unobvious - "combination lock" type
Description: Apparatus wherein the information conveyed by the indicators is in some code not obvious to an uninformed operator, whereby the operation is similar to that required by combination locks in that the indicators must be positioned in a predetermined relationship to allow flow through the system.

Patents under this class:

Patent Number Title Of Patent Date Issued
4700747 Proportional hydraulic distributor Oct. 20, 1987
4664420 Pneumatic self-sealing female coupling incorporating combination locking tumblers May. 12, 1987
4635844 Electronic control device for liquids Jan. 13, 1987
4549578 Coded fluid control system Oct. 29, 1985
4414858 Steam turbine fluid sampling apparatus Nov. 15, 1983
4397334 Fluid control system Aug. 9, 1983
4353230 Combination controlled fluid pressure actuated door lock Oct. 12, 1982
4250929 Pneumatically operated switch Feb. 17, 1981
4196939 Auto anti-theft system Apr. 8, 1980
4061158 Valve with combination lock and remote control Dec. 6, 1977
4020862 Apparatus for controlling the volume and pressure of a pressure medium in a die-casting machine May. 3, 1977

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