This is a very clean 92-page (plus 3 blank "Memoranda" pages) 5 1/4" x 8 1/4" paperback staple-bound book "Servicing by Signal Substitution" by Precision Apparatus Co., Inc. Page 11 states (see pic 4) "Instructions and Guide for Operation of the PRECISION Service-Laboratory Signal-Marking Generator Series E-200-C Featuring the PRECISION Method of Dynamic Receiver Analysis." It's really in incredible shape (actual (c)1953 book and not a "New Laser Reprint" like I see being sold on eBay).
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