GGG-B-121B, FEDERAL SPECIFICATION: BAR, SINE: PLATE SINE (AND FIXTURES) (4 JUN 1964)

GGG-B-121B, FEDERAL SPECIFICATION: BAR, SINE: PLATE SINE (AND FIXTURES) (4 JUN 1964)., This specification covers requirements for sine bars, plates, and fixtures. These are for use in inspection and layout work.