US76704A - Impboved ooal-exoayating maoeijte - Google Patents

Impboved ooal-exoayating maoeijte Download PDF

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Publication number
US76704A
US76704A US76704DA US76704A US 76704 A US76704 A US 76704A US 76704D A US76704D A US 76704DA US 76704 A US76704 A US 76704A
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US
United States
Prior art keywords
maoeijte
impboved
exoayating
ooal
impboved ooal
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Expired - Lifetime
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C29/00—Propulsion of machines for slitting or completely freeing the mineral from the seam
    • E21C29/02—Propulsion of machines for slitting or completely freeing the mineral from the seam by means on the machine exerting a thrust against fixed supports
US76704D Impboved ooal-exoayating maoeijte Expired - Lifetime US76704A (en)

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US76704A true US76704A (en) 1868-04-14

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ID=2146206

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US76704D Expired - Lifetime US76704A (en) Impboved ooal-exoayating maoeijte

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US (1) US76704A (en)

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