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Precision incremental capacitor

1975-1984

Resistance Deviation Bridge

1980-1989

Standard resistance box

1970-1979

Seven decade resistance box

1985-1989

10x1 megaohm decade resistance box. Made and used by J.J. Instruments Ltd

1970-1979

10x1 kilohom decade standard resistance box

1970-1979
Student's potentiometer, type STD10, by JJ Instruments (Educational Measurements Ltd., Warsash, Southampton), 1965-1975

Student's potentiometer

1960-1979
Apparatus for demonstrating the properties of electrical machines for use in educational establishments, type number FH2 MK2, serial No. 354, by J.J.Instruments Ltd., Brook Avenue, Warsash, Hants, SO3 6HP, England. Incomplete.

Apparatus for demonstrating the properties of electrical machines for use in educational establishments

1980-1989