US PATENT SUBCLASS 81 / 27
.~ Rod encircling type

Current as of: June, 1999
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81 /   HD   TOOLS

20  DF  HAMMER {6}
27.~ Rod encircling type

DEFINITION

Classification: 81/27

Rod encircling type:

(under subclass 20) Hammer wherein the impacting surface includes a slot adapted to receive a tubular member.

(1) Note. This subclass includes devices disclosed for driving a valve or draw off tube into a barrel.