Standard resistance box
1970-1979
Resistance Deviation Bridge
1980-1989
Seven decade resistance box
1985-1989
Precision incremental capacitor
1975-1984
10x1 kilohom decade standard resistance box
1970-1979
10x1 megaohm decade resistance box. Made and used by J.J. Instruments Ltd
1970-1979
Student's potentiometer
1960-1979
Apparatus for demonstrating the properties of electrical machines for use in educational establishments
1980-1989