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ca.1915 Mason
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American Mason Safety Tread Catalog · page 21 (ca1915)

 
Mason Safety Tread on Smooth Iron
MASON SAFETY TREAD ON SMOOTH IRON
Mason Safety Tread Strips between Vault Light Lenses
SAFETY TREAD STRIPS BETWEEN LENSES
In Cement Vault Light on an Inclined Walk, and in Cement Sidewalk from Vault Light to Curb
Rogers Hotel, Minneapolis
 McKinley Manual Training School, Washington, D.C.
ROGER HOTEL, MINNEAPOLIS, MINN.
Marble Stairway, Brass (Delta Metal) Base, Mason Safety Tread Used 		McKINLEY MANUAL TRAINING SCHOOL, WASHINGTON, D.C.
Main Stairway, Treads and Risers ½ Inch Thick, Karbolith with Lead Filled Mason Safety Tread on Front Edge