US PATENT SUBCLASS 400 / 175
.~.~ Detachable from carrier (e.g., interchangeable)

Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

139  DF  INCLUDING TYPE-SET-ASSEMBLAGE MOUNTED ON CARRIER AND RELATIVELY MOVABLE FOR SELECTION AND FOR IMPACT OF TYPE-FACE {11}
174  DF  .~ Type-head, per se {1}
175.~.~ Detachable from carrier (e.g., interchangeable)

DEFINITION

Classification: 400/175

Detachable from carrier (e.g., inter-changeable):

(under subclass 174) Subject matter wherein the type-head* may be removed from the type-head-carrier* and replaced thereon or another type-head replaced on the type-head-carrier.