Roll microfilm retrieving method and device therefor

Details Roll microfilm retrieving method and device therefor Roll microfilm retrieving method and device therefor

1974-03-20

1976-04-13

Stolwein, Walter

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

353 26A, 355 41, 352 92, G06K 710

Patent

active

039506525

ABSTRACT:
A roll microfilm having a plurality of consecutive frames. Each frame has a border therearound with a plurality of small sized marks located within the border and being unequally spaced apart with respect to each other for detection by a plurality of corresponding detecting elements having the same spacing.

REFERENCES:
patent: 2482242 (1949-09-01), Brustman
patent: 2820907 (1958-01-01), Silverman
patent: 3218921 (1965-11-01), Grosvenor et al.
patent: 3299272 (1967-01-01), Furukawa et al.
patent: 3435243 (1969-03-01), Webb
patent: 3538313 (1970-11-01), Thomas et al.
patent: 3609306 (1971-09-01), Langley

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