Micro Opaque Reader model AO#5095 by the American OpticalCo, estimated date 1960-1969, for reading microprint Micro Opaque Reader model AO#5095 by the American OpticalCo 1960-1969 (estimated)
Readex Opaque Viewer Model 7 serial no. 7060 made by the Readex Corporation, New York, 1982, for microprints up to 6" x 9" Readex Opaque Viewer Model 7 serial no. 7060 made by the Readex Corporation 1982