Instruction Manual 7a13 ; Differential Comparator ;

Beaverton, OR: Tektronix, Inc., 1970. First edition (presumed; no earlier dates stated). Medium quarto in pale blue plastic wraps and white spiral binding; various pagings (approx 100 pages: numerous charts, illus and diagrams in b/w, some folding. Chips and cracks to white spiral ring; small area of bumping chafing to front wrap; overal Very Good+. Paperback.

Scarce.