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Nitrogen filled mercury thermometers, glass, scale 0-400 degrees centigrade, by F. W. Johnston and Daughter, Hendon, 1950-1978

Nitrogen filled mercury thermometers

1950-1978
Nitrogen filled mercury thermometer, glass, scale-5-50 degrees centigrade, by F. W. Johnston and Daughter, Hendon, 1950-1978

Nitrogen filled mercury thermometer

1950-1978
Clenical mercury thermometer, uncalibrated, glass by F.W. Johnston and Daughter, Hendon, 1950-1978

Clenical mercury thermometer

1950-1978
Fahrenheit clinical thermometer, glass, by F. W. Johnston and Daughter, Hendon, 1950-1978

Fahrenheit clinical thermometera, glass, by F. W.

1950-1978