Image mask for microfilm roll handler

Details Image mask for microfilm roll handler Image mask for microfilm roll handler

1987-04-24

1989-03-21

Haroian, Harry N.

Optics: image projectors

Shutter

353 97, 353 26R, 353 23, G03B 2114

Patent

active

048137804

ABSTRACT:
An image mask assembly for a microfilm roll handler includes an insert having an opaque area which can be slid relative to a frame of microfilm to block light through a portion of the film and thereby mask selected portions of an image projected by the film.

REFERENCES:
patent: 2147260 (1939-02-01), Lewis
patent: 2159616 (1939-05-01), Kleerup
patent: 3269261 (1966-08-01), Porter
patent: 3342101 (1967-09-01), Zollner
patent: 3412480 (1968-11-01), Connell
patent: 3531193 (1970-09-01), Diehl
patent: 3661449 (1972-05-01), Wright

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