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The international ohm is now maintained at the National Bureau of Standards by means of double-walled manganin resistors.It is assumed that the ave rage r esistance of a group of 10 standards, selected from a group of 24 constructed in 1933, remains constant with time.No one of the 10 standards has changed in r esistance with reference to their average by more than 1 part in a million in 12 years.
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