Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1974-11-15
1976-01-20
Shapiro, Jacob
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
173139, E02D 700
Patent
active
039329992
ABSTRACT:
Driving hollow piles by utilising a hollow drive tube inserted in the tube and applying hammer blows to an abutment at the bottom of this tube.
REFERENCES:
patent: 2128742 (1938-08-01), Fuehrer
patent: 3499497 (1970-03-01), Moore
Shapiro Jacob
Taylor Woodrow International Ltd.
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