In continental Europe, 20th century, a unit used in refrigeration. Symbol, fg. It is found in two different, highly-related forms:
The unit went out of use because of its small size.
In 1971, the European Economic Community directed that use of this unit cease by 31 December 1977.¹
1. European Economic Community, Council Directive of 18 October 1971 on the approximation of the laws of the Member States relating to units of measurement (Directive 71/354/EEC), Annex, Chapter III.
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