US PATENT SUBCLASS 396 / 151
.~.~.~ Film and focusing screen interchangeable

Current as of: June, 1999
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396 /   HD   PHOTOGRAPHY

89  DF  WITH EXPOSURE OBJECTIVE FOCUSING MEANS, FOCUSING AID, OR RANGEFINDING MEANS {28}
148  DF  .~ Having viewfinder {2}
150  DF  .~.~ Including focusing screen {2}
151.~.~.~ Film and focusing screen interchangeable

DEFINITION

Classification: 396/151

Film and focusing screen interchangeable:

(under subclass 150) Subject matter wherein the focusing screen and a photos:graphic medium are successively brought into a same position relative to the exposure objective.

SEE OR SEARCH THIS CLASS, SUBCLASS:

, FOR 808, for a foreign art collection involving camera having interchangeable film and focusing screen.