(under subclass 81) Devices, having two or more distinct operating means, at least one of which is responsive to pressure of a fluid or to vacuum.
SEE OR SEARCH THIS CLASS, SUBCLASS:
81.4, for combinations of two or more distinct circuit makers and breakers, each having its own operating means, at least one of said operating means being responsive to pressure of a fluid or to vacuum.
SEE OR SEARCH CLASS
74, Machine Element or Mechanism,
625+, for gearing having provision for operation by either manual or power means, and subclass 479.01 for manually operated control lever and linkage systems having a plurality of controlling elements.
123, Internal-Combustion Engines, 179.1+, for starters equipped with dual operators.
236, Automatic Temperature and Humidity Regulation,
91, for devices operated by a plurality of thermostats.
