APA (7th ed.) Citation

United States. Bureau of Mines. (1921). Safety cut-out for trolley wires at loading chutes. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Safety Cut-out for Trolley Wires at Loading Chutes. [Washington]: [publisher not identified], 1921.

MLA (9th ed.) Citation

United States. Bureau of Mines. Safety Cut-out for Trolley Wires at Loading Chutes. [publisher not identified], 1921.

Warning: These citations may not always be 100% accurate.