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IBM 3504 Card Reader/
IBM 3505 Card Reader and
IBM 3525 Card Punch
Systems Subsystem
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Sixth Edition (October 1974)
This is a reprint of GA21-9124-4 incorporating Technical Newsletter GN21-0202 dated
19 June 1974. This edition supersedes, but does not make obsolete, the following
publications:
GA21-9124-3 with accompanying TNLs GN21-Q166, GN21-Q170,and GN21-Q202
GA21-9124-4 with accompanying TNL GN21-Q202.
Changes are periodically made to the information in this manual; any such change will
be reported in subsequent revisions or Technical Newsletters.
Requests for copies of IBM publications should be made to your IBM representative or
to the branch offive serving your locality.
A form of reader's comments is provided at the back of this publication. If the form
has been removed, comments may be addressed to IBM Corporation, Publications,
Department 245, .Rochester , Minnesota 55901.