Back in 1977 when doing a bore...we had a mole mounted on 2 wheel using pneumatic missile...you had to push on the 2 wheel mole to get any forward production. In 1981 when installing fiber along a Railroad ROW, we had to do a directional bore the rails, lost our bore head, RailRoad would not let us dig it up..big bucks lost-gone $$$
Re: Pneumatic piercing missile
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