US PATENT SUBCLASS 227 / 56
.~.~ Simultaneously used heading tools

Current as of: June, 1999
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227 /   HD   ELONGATED-MEMBER-DRIVING APPARATUS

51  DF  WITH MEANS TO HEAD MEMBER {5}
55  DF  .~ Heading tool extends within hollow portion of member {4}
56.~.~ Simultaneously used heading tools

DEFINITION

Classification: 227/56

(under subclass 55) Device including a plurality of heading means made effective during a single driving stroke to head a plurality of members.