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Field Engineering
Maintenance Manual
24-Base Machines
24-26 Card Punch
24-26 Card Punch, Models 5 and 6
27-28 Card Proof Punch
46-47 Tape to Card Punch
56 Card Verifier
65-66 Data Transceiver
526 Printing Summary Punch
534-536 Card Punch
824-826 Typewriter Card Punch
834-836 Control Unit
Foreword
This manual provides information for the mechanical maintenance of
machines using the IBM 24 base. These machine types are listed on
the title page. The IBM 29 and IBM 59 have separate maintenance
manuals (Form 225-3357 for the IBM 29, and Form 225-3367 for the
IBM 59).
It is intended to include as much information as possible within a
logical section of this manual. The sequence is related, as nearly as
poSSible, to the card path through the machine. Features, such as the
card column emitter, that pertain to a specific machine are treated in
separate sections covering the differences in 24-base machines. Special
features are also