pdf AE Bulletin 821 - Linefinder Switches - Jun57 Popular

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AE Bulletin 821 - Linefinder Switches - Jun57

Includes a list of training Bulletins for Strowger Automatic Telephone Systems. Ends at page 29 - missing "Complete circuits" section. Printed in Jul58. See the May47 edition. Contributed by Alan David and John Novack.

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