It's a 'Finning Tank Drill'. These drills were built by Finning using both old parts and newly manufactured components of Sherman Tank chassis up until the 1990s. They are a standard item in logging road construction. They are used to blast small rocky outcrops when making new logging roads and spurs. Over 500 were built.
I posted a story up about a year ago of loaning my knife to a driller and he proceeded to follow through the cut into the frame of the rig...
It was a rig very similar to that one but made by CME. Basically they build the rig and then mount it to a chassis (truck or track). I prefer the balloon tire chassis because they are faster and have floatation.
Just found this piece of driftwood that's been in my family for 40+ years, I remember pickin' it up off a beach on the Stillwater reservoir with my mom as a kid. It's been missing for 30 of those years and it turned up in an old toy box my grandfather made when I was 8.
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