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