 | Colorado. Bureau of Labor Statistics - 1904 - 644 halaman
...can not be distinctly heard, the owner or agent shall provide and maintain a metal tube from top to bottom of the slope or shaft, or a telephone connection...the top and bottom of the shaft or slope; and in the top of every shaft shall keep an approved safety gate and an approved safety catch, and sufficient... | |
 | United States. Bureau of Labor - 1904 - 1428 halaman
...operator shall provide and maintain a metal tube from the top to the bottom of the shaft or slope, not exceed ten men at any one time for any purpose...such escapement or connection is completed. (cj S top of such shaft or slope; and there shall also be maintained the ordinary means »f Hoisting mu-... | |
 | 1904 - 1426 halaman
...metal tube ^"' from top to the bottom of the slope or shaft, or a telephone connection suitably adopted [adapted] to the free passage of sound, through which conversation may be held between j>ersons at the bottom and at the top of the shaft or slope; also the ordinary means of signaling to... | |
 | Pennsylvania. Department of Mines - 1905 - 906 halaman
...and maintain, from the top to bottom of every shaft where persons are raised or lowered, a metal tube suitably adapted to the free passage of sound through...which conversation may be held between persons at the top and bottom of said shaft, and also a means of signaling from the top to the bottom thereof, and... | |
 | New York (State). Dept. of Labor - 1906 - 992 halaman
...the top to the bottom of every shaft where persons are raised or lowered a telephone or a metal tube suitably adapted to the free passage of sound, through...which conversation may be held between persons at the top and bottom of said shaft, and also means of signaling from the top to the bottom thereof, and shall... | |
 | West Virginia - 1907 - 710 halaman
...shall forthwith provide, and hereafter maintain, a metal tube from the top to the bottom of such shaft suitably adapted to the free passage of sound through...which conversation may be held between persons at the top and at the bottom of the shaft, also the ordinary means of signaling, and an approved safety catch... | |
 | Texas - 1907 - 556 halaman
...there shall be provided a metal tube or telephone from the top to the bottom of the shaft or slope through which conversation may be held between persons at the bottom and top of such shaft or slope, and that there shall also be maintained an efficient system of signaling... | |
 | Colorado. Bureau of Labor Statistics - 1908 - 328 halaman
...can not be distinctly heard, the owner or agent shall provide and maintain a metal tube from top to bottom of the slope or shaft, or a telephone connection...the top and bottom of the shaft or slope; and in the top of every shaft shall keep an approved safety gate and an approved safety catch, and sufficient... | |
 | United States. Bureau of Labor - 1908 - 1584 halaman
...operator shall provide and maintain a metal tube from the top to the bottom of the shaft or slope, suitably adapted to the free passage of sound, through...conversation may be held between persons at the bottom and top of such shaft or slope: and there shall also be maintained the ordinary means of signaling to and... | |
 | 1908 - 442 halaman
...shall forthwith provide, and hereafter maintain, a metal tube from the top to the bottom of such shaft suitably adapted to the free passage of sound through...which conversation may be held between persons at the top and :it the bottom of the shaft, also the ordinary means of signaling, and an approved safety catch... | |
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... suitably adapted to the free passage of sound, through which conversation may be held between persons at the bottom and... 
