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SAFETY TREAD Any marine engineer will appreciate the unique advantages of Tri-Lok gratings and safety treads for engine room gratings, cargo hatchways, bridgeways and gangways. The patented triple lock feature without the use of rivets or bolts gives Tri-Lok the greatest strength plus the lightest dead weight of any other grating on the market. Complete ventilation and maximum light is assured by the remarkable simplicity of Tri-Lok construction which eliminates all acute angles and at the same time provides a safe, sure- footed tread so necessary aboard sea-going ships. You will find it interesting and profitable to know more about Tri-Lok Gratings and Safety Steps because they give you every advantage at less cost. Inquire today for descriptive bulletin. - THE TRI-LOK COMPANY 45515 BUTLER STREET - PITTSBURGH, PA. MARINE REVIEW—July, 1928 29