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Concordia type RM 6-o.d. electric cap lamp, approval numbers 19.

Bibliographic Details
Corporate Author:	United States. Bureau of Mines
Format:	Government Document eBook
Language:	English
Published:	[Washington] : [publisher not identified], 1923.
Series:	Mines Bur. Rpt. of Investigation No. 2515
Subjects:	Lamps. Mines and mineral resources. Electronic books.
Online Access:	Connect to the full text of this electronic document

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