NAVY MIL-S-20561 A-1974
SPRING; ESCAPEMENT, CORROSION-RESISTING

Standard No.

NAVY MIL-S-20561 A-1974

Release Date

1974

Published By

United States Navy

Scope

The spring covered by this specification shall cover one　class spring for mechanical timing movements, designated: spring,escapement, corrosion-resisting.