IS/IEC 60255 : Part 21 : Sec 1 : 1988 Title: Electrical Relays Part 21 Vibration, Shock, Bump and Seismic Tests on Measuring Relays and Protection Equipment Section 1 Vibration tests (Sinusoidal) Format: Print Pages: 11 Year: 1988 Publisher: Bureau of Indian Standards Availability: Out of Stock