High-Speed Double Deck Screw Machines

High-Speed Double Deck Screw Machines for horizontal installation Manufactured by Sprague Electric Company from the Article STANDARDS OF PRACTICE IN ELECTRIC-ELEVATOR INSTALLATION. By Percival Robert Moses. from The Engineering Magazine Devoted to Industrial Progress Volume XIV October 1897 - March 1898 The Engineering Magazine Co

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High-Speed Double Deck Screw Machines for horizontal installation Manufactured by Sprague Electric Company from the Article STANDARDS OF PRACTICE IN ELECTRIC-ELEVATOR INSTALLATION. By Percival Robert Moses. from The Engineering Magazine Devoted to Industrial Progress Volume XIV October 1897 - March 1898 The Engineering Magazine Co