US PATENT SUBCLASS 346 / 67
.~ Single marker

Current as of: June, 1999
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346 /   HD   RECORDERS

66  DF  SINGLE FUNCTION RECORDER, DUPLICATE OR PORPORTIONAL SCALE RECORDS {1}
67.~ Single marker

DEFINITION

Classification: 346/67

(under subclass 66) Recorders of the type wherein but a single marker is employed. Usually the records are carbons of one another, or are records made by a stylus piercing a number of superposed record receivers.