US PATENT SUBCLASS 137 / 636.2
.~.~ Rotation about either of two pivotal axes

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137 /   HD   FLUID HANDLING

561 R  DF  SYSTEMS {32}
636  DF  .~ With selective motion for plural valve actuator {4}
636.2.~.~ Rotation about either of two pivotal axes

DEFINITION

Classification: 137/636.2

(under subclass 636) Devices in which the movements are rotation of the actuator arm about either of two pivots or pivotal axes.