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- 14030122 contributor B525262.
- 14030122 contributor B525263.
- 14030122 created "1913.".
- 14030122 date "1913".
- 14030122 date "1913.".
- 14030122 dateCopyrighted "1913.".
- 14030122 extent "38 p.".
- 14030122 isPartOf "United States. Bureau of Mines. Bulletin ; no. 68.".
- 14030122 isPartOf "[U.S.] Bureau of mines. Bulletin 68".
- 14030122 issued "1913".
- 14030122 issued "1913.".
- 14030122 language "eng".
- 14030122 publisher "Washington, Govt. Print. Off.,".
- 14030122 subject "Electric switchgear.".
- 14030122 subject "Electricity in mining.".
- 14030122 subject "TN23 .U4 no. 68".
- 14030122 title "Electric switches for use in gaseous mines, by H.H. Clark and R.W. Crocker.".
- 14030122 type "text".