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  • All fields: Hydraulic mining--1940-1950.
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    • Manion Placer

    • View of a steam shovel and ore processing machinery with a conveyor elevator. Letters read "Manion Placer" and "Lorain."
    • Mining machinery--1940-1950.; Conveying systems--1940-1950.; Hydraulic mining--1940-1950.; Steam shovels--1940-1950.
    • [between 1940 and 1950?]
    • Manion Placer

    • View of a steam shovel and ore processing machinery. Letters read "Manion Placer" and "Lorain 77."
    • Mining machinery--1940-1950.; Hydraulic mining--1940-1950.; Steam shovels--1940-1950.
    • [between 1940 and 1950?]
    • Manion Placer

    • View of a steam shovel and ore processing machinery with a conveyor elevator.
    • Conveying systems--1940-1950.; Hydraulic mining--1940-1950.; Mining machinery--1940-1950.; Steam shovels--1940-1950.
    • [between 1940 and 1950?]

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