Automatic microfilm retrieval system

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Details

364900, 353 27A, G06F 1502, G03B 2308

Patent

active

041797434

ABSTRACT:
An automatic microfilm retrieval system for retrieving contents of a dictionary or the like recorded on a microfilm and displaying them on a screen is disclosed. Said microfilm includes a retrieval cord and divided into a plurality of unit regions to be displayed on said screen at the same time and further includes a cord added to each of said unit regions and representing an index word whose contents are included in each of said unit regions. A plurality of said unit regions are assembled into a plurality of groups. To each of said groups are added cords representing first and last index words included in each of said groups. Provision is made of a subtracter which functions to compare said cords read out by a reading head with key inputs obtained by depressing keys provided on a key board and control movements of a movable stage holding said microfilm thereon, thereby retrieving said microfilm.

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patent: 3949375 (1976-04-01), Ciarlo
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patent: 4074853 (1978-02-01), Flint

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