Sullivan-Griffiths inductance (second grade) by H.W. Sullivan Ltd.
1962
Sullivan Griffiths inductance (second grade)
1943
Sullivan Griffiths inductance (second grade)
1943
Sullivan Griffiths inductance (second grade)
1943
adjustable self-inductance
1905
Sullivan Griffiths inductance (second grade)
1943
Sullivan Griffiths inductance (second grade)
1937
Sullivan Griffiths inductance (second grade)
1943
Sullivan Griffiths inductance (second grade)
1939
Sullivan Griffiths inductance (second grade)
1943
Sullivan Griffiths inductance (second grade)
1943
Variable mutual inductance No. 17552 by H. Tinsley and Co.
1925-1935
Air-cored inductance
1980