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bits offer loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentsusreader031viewer20220204135b8d871c09d3f2187e8c2cb4html5thumbnails2jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=3Page 3button div class=ts-imageimg data-url=and-drifting-and-tunnelling-drill-bit-design-model-37-222-gauge-buttonshtmlpage=3 data-page=3 class=ts-thumb lazyload alt=Page 3: and · Drifting and tunnelling Drill bit design Model -37 2+2+2 gauge buttons 3 front buttons With 9 buttons and superb flushing model -37 bits offer loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentsusreader031viewer20220204135b8d871c09d3f2187e8c2cb4html5thumbnails3jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=4Page 4button div class=ts-imageimg 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