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Permissible mine equipment approved.

Year:	1913
Document Type:	USBI
Issuing Agency:	U.S. Govt. Print. Off.
Subjects:	Mining machinery
	Mine tools
Links:	Feb, 1926 (r:6001)
	Aug, 1926 (r:6012)
	Feb, 1927 (r:6021)
	Aug, 1927 (r:6047)