Darby Perry Excavator Double Ended

Darby Perry Excavator Double Ended Fig.5
Darby Perry Excavator Double Ended Fig.7/8
Darby Perry Excavator Double Ended Fig.9/10
Darby Perry Excavator Double Ended Fig.11/12
Darby Perry Excavator Double Ended Fig.13/14
Darby Perry Excavator Double Ended Fig.15/16
Darby Perry Excavator Double Ended Fig.17/18
Darby Perry Excavator Double Ended Fig.19/20
Darby Perry Excavator Double Ended Fig.21/22