A device to be inserted in a slide slot in a projector. The device having an end turned up at a substantially 45 DEG angle so that slides having a corner keyed by clipping the corner on a line 45 DEG from the bottom will only fit into the slide slot in one position.
申请公布号
US3881816(A)
申请公布日期
1975.05.06
申请号
US19740435346
申请日期
1974.01.21
申请人
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE ARMY
发明人
JENKINS, ANDREW H.;MORGAN, ROBERT L.;BENNETT, RAYMOND P.;DUGAS, CHARLES E.
