Curious Error in a Trade Mark. AN IMPROVED ROCK DRILL. THE McKEERNAN ROCK DRILL. Coal Production of the United States. Effect on Bridges of Motive Pourer at High Speeds. 4 A CONVENIENT DRILL CASE. THE WEISS DRILL CASE. IMPROVED BINDING FOR BLANK BOOKS. WALLEN'S IMPROVED BOOKBINDING., scientific american, 1897-06-26

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