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Hewlett-packard 522B electronic counter service manual
This item is a vintage 1954, good condition original Operating & Service Manual for the 522B Electronic Counter from Hewlett-Packard Company. It presents all the calibration & test procedures, assembly drawings and schematics for this equipment as well as the theory of operation and maintenance. There is a stamp on the cover and inside first page "Property of Calibration Laboratory". This is a very hard to find manual for this device that uses vacuum tubes as active
