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30 Rock from books.google.com
30 Bit wear .. Decreased 10 to 35 pct . 26 , 30 Drilling rate .. Increased 20 to 60 pct . 26 , 30 Rock hardness .. Decreased ..... 30 Rock strength .. Decreased 9 to 20 pct .. 30 Igneous rocks 12 .1 - Bit life ..... Increased .
30 Rock from books.google.com
30 rock 36 . 38 . 3.5 . noch 33 . 33. rock roch 36 . 36. rock 39 . 38 36 36 . 40.34 rock 30 . roch 34 . 36 . 40 . 40 . rock 34 34 . ... 30 . 34. rock 41 . 32 30 . 40. rock rock 36 30. 24. rock roch 19. 20 . gröck 28 30rock 30 rock 25 .
30 Rock from books.google.com
140 Rock , medium . 150-200 150-200 Limonite , ore . 200 100-200 Ore , soft - medium . 15-100 Rock , medium . 50 120 Ore , medium . 60-70 150 Do. 25-30 3-4 Rock , hard . 200-300 100 Ore , soft . 45-50 15 Ore , hard .
30 Rock from books.google.com
m2 Bottom Type Depth ( cm ) L - 1 2a / 20 1,731 15 Silty - sand , gravel L - 4 2a / 17 1,285 15-30 Bedrock , cobbles L - 5A 1 11 217 15-30 Rock , cobbles , gravel C 1 10 240 15-30 Rock , cobbles , gravel L - 6 1 17 304 15-30 Rock ...
30 Rock from books.google.com
m2 Bottom Type Depth ( cm ) June 11 , 1969 L - 1 20 1,731 15 Silty - sand , gravel L - 4 17 1,285 15-30 Bedrock , cobbles L - 5A 1 ון 217 15-30 Rock , cobbles , gravel С 1 10 240 15-30 Rock , cobbles , gravel L - 6 1 17 304 15-30 Rock ...
30 Rock from books.google.com
335 17 30 4 Till 157 8/1/46 110 4/24/36 Till Rock , at 0-17 17 Domestic . Low in fall . 320 100 6 3-4 30 8/46 Hard Rock Till Rock 0-8 8-100 Domestic . 335 500 6 Hard 2-3 1915 Rock Till Rock 0-25 25-500 Drinking , 100 people several ...
30 Rock from books.google.com
Rock drills , Automatic air - feed regulator for . F. M. Slater . 1,543,883 ; June 30 . Rock drills , Cushioning device for . L. C. Bayles . 1,554,776 ; Sept. 22 . Rock drills , Feeding mechanism for . H. V. Haight .
30 Rock from books.google.com
... Change Column 5 to read Stockton Lightstation , California 121 17 30 W 37 58 30 N ( change in designation of nia ... 7a to read 2.5 Rock , California Change Column 6 to read ALA 2 ; Column 7a to read 3.0 ; Column 10 to read 30 Rock ...
30 Rock from books.google.com
... 30 574 381 398 395 319 413 357 30 30 30 30 30 30 621 634 631 580 646 605 $ 301 30 566 30 30 317 370 371 409 317 579 615 643 579 30 30 Rock - drill . C. S. Westbrook . 312,538 | Feb. 17 1488 Rock - drill . Hand - power L. W. Tracy .
30 Rock from books.google.com
... highest Foel Dregarn 103 9 point 33 22 30 Precelly Top 70 30 45 58302 Precelly Top o 67142 Nipple Rock 75 5 151 56878 Brenin Fawr 101 23 048542 Rock near ' Trecoon Farm 34 24 Ferwig Steeple 33 29 Brenin Fawr 10 54 056352 Precelly ...