BS PD 6561:1992

A draft amendment to BS 6789-1:1984 "Apparatus with one or more particular functions for connection to the British Telecommunications public switched telephone network. Part 1. Specification for general requirements"
standard by BSI Group, 10/31/1992

BS E9065:1976

Specification for harmonized system of quality assessment for electronic components. Blank detail specification: small power transmitting tubes of anode dissipation up to 1 kW
standard by BSI Group, 09/15/1976

BS PAS 11000:2006

Collaborative business relationships. A framework specification
standard by BSI Group, 11/15/2006