This is a binder full of lock codes, depths, spacings, instructions on what code card to use as well as key blank needed. It is almost AN INCH THICK of information from 1988. It is a binder called THE NATIONAL LOCKSMITH, Depth and Spacing Book, Volume 1, No NDSB, Published by National Publishing Company. The information doesn't get old and is a great starter for the new locksmith to get an understanding of the how and why of making all types of keys.
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