Specification for control plug cocks for low-pressure gases
standard by BSI Group, 03/31/1967
Specification for coal tar pitches for building purposes
standard by BSI Group, 09/15/1965
Flame proof air-break circuit breakers for voltages not exceeding 660 volts
standard by BSI Group, 01/30/1933
Specification for split cotter pins. Metric and inch series
standard by BSI Group, 03/27/1974