|Acc.#1998.0191||Danko - page 11||AC#667|
SELECTIVE SOLDERING. (Experimental)
Solder Resist as Applied to Pre-Fabricated Conductive Patterns
Group Overall View. Showing Process Steps.
August 30, 1951 Signal Corps Engineering Laboratories, image#32777
This image was taken by the Signal Corps and appears as if the actual circuit boards were laid upon prepared text paper then photographed.