. Mechanical Contracting & Plumbing January-December 1909. Ventilators and Chimney Cowls My patent rotary ventilator isbacked by a guarantee. It is the best ventilatoron the market. Writefor particulars, handsome bookletsof testimonials and informationmailed free. GEO. D. PEARSON & CO. Office and Works17 Pontiao St. - Montreal. THIS IS THE DAY OF INVESTIGATION Get in line and let us proveto you that the GENUINE Armstrong Stocks and Dies ARE THE on request. The Armstrong Mfg. Co. 317 Knowlton , - Conn.

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