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- 21026772 contributor B616926.
- 21026772 created "1921".
- 21026772 date "1921".
- 21026772 dateCopyrighted "1921".
- 21026772 extent "214 p.".
- 21026772 isPartOf "Circular of the Bureau of Standards ; no. 115".
- 21026772 issued "1921".
- 21026772 language "eng".
- 21026772 publisher "Washington, Govt. Print. Off.,".
- 21026772 subject "QC100 .U555 no. 112".
- 21026772 subject "Telephone.".
- 21026772 title "Telephone service. June 24, 1921.".
- 21026772 type "text".