IS 5138-1981
Specification for double frame lug-shaped metal hairsprings

Standard No.

IS 5138-1981

Release Date

1981

Published By

IN-BIS

Latest

IS 5138-1981

Scope

This standard specifies the type, form and range of the number of ear-shaped metal travellers for use in the ring doubling frame in conjunction with the rings conforming to IS : 3078-1976〓.

IS 5138-1981 history

• 1981 IS 5138-1981 Specification for double frame lug-shaped metal hairsprings