Parsons trenching machine - keystone excavator and back filler used to dig and fill North Denver storm sewer trench
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Cancel EditFord Optical Company., Parsons trenching machine - keystone excavator and back filler used to dig and fill North Denver storm sewer trench (1910-1920). Denver Public Library Digital Collections, accessed 21/03/2025, https://digital.denverlibrary.org/nodes/view/1102136