10-

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From AISI and SAE standards nomenclature for iron and steel grades for carbon steels with a maximum of 1% carbon content.

10-

1. (metallurgy ) Identifying a steel grade with a maximum of 1% carbon.

It is used in forming a four digit term, with the remaining two digits attached to the prefix signifying the sub-1% fractional percentage value of the carbon content of the steel. For example, a steel with 0.95% carbon would be graded 1095. (10+95, from 0."95"%)

The syllable "ten" was originally chosen to help novice operators fill an appropriate amount of time so that the dynamotor used to power 1930s and 1940s radio transmitters could spin up to full power before the semantically meaningful second number was transmitted.

10-

1. Indicates a ten-code .

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