Certificate pursuant to section 12 of the Weights and Measures Act 1985 ... the Secretary of State for Trade and Industry hereby certifies as suitable for use for trade the following pattern of a liquid flowmeter ... : submitted by Schlumberger Technologies.
Great Britain.Department of Trade and Industry.
National Weights and Measures Laboratory.
Schlumberger Technologies.
Teddington : National Weights and Measures Laboratory,
1994.
"Reference no: STD  6624"