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Mullen Replaceable Vault Light ad in the Pittsburgh Daily Post, October 16, 1914
Here's the Whole Secret of
The Mullen Replaceable Vault
Light Sidewalk.

SEE THAT THREAD
It's the THREAD that is set solid in the cement.
The Glass Screws in Quickly and Easily

It's no trouble to replace a broken vault light. It takes but a few minutes. You do NOT have to break your sidewalk, or leave disfiguring chisel marks. Special waterproofing makes the replaced glass as impervious to rain and weather as the original light.

The Mullen Vault Light Sidewalk
Costs Less, Wears Longer, Looks Better
Wherever builders study the question, you will find our sidewalks.
Men Who Know Choose Mullen's
Call, write or telephone for particulars.
The Mullen Replaceable Vault Light Co.
Fulton Building Pittsburgh, Pa.
Bell Telephone, Grant 2743
Pittsburgh Daily Post, October 16, 1914