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Coal Mines and Mining--Laboratories.
2
Electric current rectifiers.
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Industrial equipment.
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Rectifier instruments.
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Research, Industrial--Laboratories.
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Consolidation Coal Company
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1.
Hewittic Rectifier at Jamison Coal Mine No. 9 Laboratory
IDNO:
002401
Title:
Hewittic Rectifier at Jamison Coal Mine No. 9 Laboratory
Description:
Hewittic Rectifier changes AC to DC current.
2.
Hewittic Rectifier at Jamison Coal Mine No. 9 Laboratory
IDNO:
002402
Title:
Hewittic Rectifier at Jamison Coal Mine No. 9 Laboratory
Description:
Hewittic Rectifier changes AC to DC current.
