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What do a.m. and p.m. stand for?

magnetic drum

noun, Computers.
1.
a cylinder coated with magnetic material, on which data and programs can be stored.
Also called drum.
Origin of magnetic drum
1945-1950
1945-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Value for magnetic

13
17
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