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Portable Six's maximum and minimum self-registering thermometer

1875

Very delicate spiral bulb thermometer

1876
Automatic precision resistance A.C. double bridge type A6 with six decade swiches, made by Automatic Systems Laboratories [ASL], Leighton Buzzard, Beds., c.1980.

Automatic precision resistance A.C. double bridge type A6 with six decade swiches

1980-1984