File:Large pipe elbows for the Army are formed at Tube Turns, Inc., by heating lengths of pipe with gas flames and forcing them around a die, Louisville, Ky. LCCN2017878371.jpg
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![File:Large pipe elbows for the Army are formed at Tube Turns, Inc., by heating lengths of pipe with gas flames and forcing them around a die, Louisville, Ky. LCCN2017878371.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Large_pipe_elbows_for_the_Army_are_formed_at_Tube_Turns%2C_Inc.%2C_by_heating_lengths_of_pipe_with_gas_flames_and_forcing_them_around_a_die%2C_Louisville%2C_Ky._LCCN2017878371.jpg/749px-thumbnail.jpg?20180712204215)
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