A P&H Model-206 Corduroy Power Shovel used in a 1929-1935 limestone mining operation.

alt="A P&H Model-206 Corduroy Power Shovel used in Tapo Alto Shell & Fertilizer Company's 1929-1935 coquina limestone mining operation on Tapo Alto peak, near Simi Valley, California. December 7, 2023." border="0">

A P&H Model-206 Corduroy Power Shovel used in Tapo Alto Shell & Fertilizer Company's 1929-1935 coquina limestone mining operation on Tapo Alto peak, near Simi Valley, California. December 7, 2023.

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