Certificate of EEC pattern approval of a measuring instrument issued by the Secretary of State for Trade and Industry ... to Butterfield Engineering (WSM) Ltd ... in respect of: a road tanker meter measuring system for liquids other than water.
Great Britain.Department of Trade and Industry.
National Weights and Measures Laboratory.
Butterfield Engineering (WSM) Limited (Firm).
Teddington : National Weights and Measures Laboratory,
1987.
Measuring instruments