Standards
[CURRENT]
SN ISO 3159
; NIHS 95-11:2009-12
SN ISO 3159
; NIHS 95-11:2009-12
Timekeeping instruments - Wrist-chronometers with spring balance oscillator
Title (German)
Zeitmessinstrumente - Armbandchronometer mit Unruh - Spiralfeder - Oszillator