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MP 8 swamp and marine geophone, 21x5 diam cm

Geophone, sectioned, c.1955

1955

GAA reflection geophone

1950

Swamp geophone

1960
EVP 7 geophone by Electrotech, 1956-60. 17x17x5 cm

EVP 7 geophone by Electrotech, 1956-60. 17x17x5 cm

1956-1960
Two GS 11D geophones, 1960-76, (one incomplete)

Two GS 11D geophones, 1960-76, (one incomplete)

1960-1976
Two GZW swamp geophones to BP's design made by ETEI Ltd, c. 1960. 50x10 diam cm

Two GZW swamp geophones to BP's design made by ETEI Ltd

1960
Two GDA or GDC geophones, (1 pressure-sensitive, one velocity), 1950-53

Two GDA or GDC geophones

1950-1953
Three GAD swamp geophones, c. 1950. One sealed in resin. 12x9 diam cm

Three GAD swamp geophones

1950
Swamp or marine geophone (unidentified). 20x3 diam cm

Swamp or marine geophone