Bucyrus-Erie 20-H hydraulic excavator equipped with special rotary boom attachment. With increasing competition from European hydraulic-excavator producers in the early 1960s, traditional American ...
https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!270196~!0#focus ...
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