US PATENT SUBCLASS 400 / 154.4
.~.~.~.~ Via coded disc in electric or magnetic circuit (e.g, photoelectric)

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}
153  DF  .~ Imprint by movement of record-medium against type-face {3}
154  DF  .~.~ By hammer impacting record-medium against type-face on type-head (e.g., type shuttle, etc.) {3}
154.1  DF  .~.~.~ Including selection of type-face {8}
154.4.~.~.~.~ Via coded disc in electric or magnetic circuit (e.g, photoelectric)

DEFINITION

Classification: 400/154.4

Via coded disc in electric or magnetic circuit (e.g., photoelectric):

(under subclass 154.1) Subject matter. wherein said selecting mechanism, includes one or more circular plates, each plate being rotatable to a position where particular index characteristics on the plate(s) are related to an arrangement within the mechanism that causes completion of an electrical or magnetic circuit, the completion of the circuit effecting selection or choice of the type-face* desired by the typist.

(1) Note. The index characteristics may be, for example, notches or apertures in the discs, which permit passage of a beam of light that actuates a photoelectric cell when the notches or apertures in several discs are aligned, or may be magnetic code in one or more discs, which completes a circuit when proper alignment of the code disc(s) is accomplished.