US PATENT SUBCLASS 74 / 41
.~.~.~ Pump jack type

Current as of: June, 1999
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74 /   HD   MACHINE ELEMENT OR MECHANISM

*  DD  MECHANICAL MOVEMENTS {15}
25  DF  .~ Rotary to or from reciprocating or oscillating {20}
40  DF  .~.~ Crank, pitman, lever, and slide {1}
41.~.~.~ Pump jack type

DEFINITION

Classification: 74/41

(under subclass 40) Mechanisms, including a crank, pitman, lever and slide of the pump jack type.