དེ་ནི་ཤིན་ཏུ་འབྲས་བུར་བཅས། །དེ་ལས་གཞན་དུ་འགྱུར་མ་མཆིས། ༎ 27 ༎
A pump drill is a variant of the bow drill that uses a coiled rope around a cross-section of wooden stake spin the shaft by pumping up and down a cross-member.[12],[13]
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