 | Iowa. General Assembly - 1886 - 1088 halaman
...operator, lessee or agent shall provide and maintain a metal tube from the top to the bottom of the shaft suitably adapted to the free passage of sound through...persons at the bottom and at the top of the shaft; also, the ordinary means of signaling to and from the top and bottom of the shaft and an approved safety... | |
 | West Virginia - 1887 - 690 halaman
...maintain, metal tubeior a metal tube from the top to the bottom of such shaft, £p0mmuulcasuitably 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 MeatX80f 8lg. means of signaling, and an approved... | |
 | Pennsylvania. State Board of Health and Vital Statistics - 1887 - 1108 halaman
...agent shall provide and maintain a metal speaking tube from the top to the bottom of the shaft, * * * * also the ordinary means of signaling to and from the top and bottom of the shaft, and an approved safety catch, and sufficient cover over head on every carriage used i'or lowering and... | |
 | Tennessee. Bureau of Agriculture, Statistics, and Mines - 1887 - 956 halaman
...calculated and adapted to the free passage of sound therein, through which conversation may be held by find between persons at the bottom and at the top of the shaft or slope, and also some modern practical means for signaling from and to the top of the shaft from the bottom... | |
 | Indiana. Department of Statistics - 1894 - 802 halaman
...lessee of all coal mines shall provide and maintain a metal tube from the bottom of the shaft, euitably adapted to the free passage of sound, through which conversation may be held between1 persons at the bottom and top of the shaft. SEC. 22. That the provisions of this act shall... | |
 | 1887 - 344 halaman
...a metal ""вtube from the top to the bottom of the shaft, suitably adapted to the free passage Ibld of sound, through which conversation may be held between persons at the bot- Speaking-tube«. torn and at the top of the shaft, also the ordinary means of signalling to and... | |
 | Sir Frederick Augustus Abel - 1889 - 452 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 signalling, and an approved safety catch... | |
 | Sir Frederick Augustus Abel - 1889 - 452 halaman
...operator, lessee or agent shall provide and maintain a metal tube from the top to the bottom of the shaft, suitably adapted to the free passage of sound through which conversation may beheld between persons at the bottom and at the top of the shaft ; also, the ordinary means of signalling... | |
 | Sir Frederick Augustus Abel - 1889 - 448 halaman
...bottom of the shaft, suitably adapted to the free passage of sound through which conversation may beheld between persons at the bottom and at the top of the shaft; also, the ordinary means of signalling to and from the top and bottom of the shaft and an approved... | |
 | West Virginia. State Bureau of Labor - 1910 - 314 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... | |
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... suitably adapted to the free passage of sound, through which conversation may be held between persons at the bottom and... 
