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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
5-25 20-50 Rock , medium . 30-50 250 Ore , medium . 100 80-100 Do. 3-20 15-40 Rock . 40 80 Ore , soft - medium . 100-200 90-170 Do. 7-8 30 Rock . 80-120 80-120 Ore , soft - hard . 5-10 16-30 Rock , hard . 200 100-200 Ore , medium - 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
289 John Cullen Old River Road 290 44 30 Hard Till 87 6/4/46 Domestic Till Rock , at 0-44 44 Lin . 291 Ernest Brown Sayles Road 295 19 30 Hard Till Till 107 6/4/46 0-19 19 Domestic . Dry in summer , Rock , at Lin .
30 Rock from books.google.com
1 22 81 32 301 Precelly Top 53 I 30 49938 | Brenin Fawr 76 10 30 15469 Brenin Fawr 79 • 39 40641 Barrow near ... highest Foel Dregarn 103 9 point 33 22 30 Precelly Top 70 30 45 58302 Precelly Top 45 8 0 67142 Nipple Rock 75 5 15 56878 ...
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 .