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Pittsburgh Daily Post · May 9, 1915
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Mullen Replaceable Vault Light ad in the Pittsburgh Daily Post, May 9, 1915

These Replaceable Lights are now being used extensively in the construction of all modern buildings, where a strong defused light is needed under the sidewalk, skylights, canopies, etc.
If you want to utilize your basement space—rebuild your sidewalk with the
Mullen Replaceable
Vault Lights

and you will have plenty of nature's light in the basement, furthermore, the initial cost and upkeep is less than any other sidewalk.
If you are building or contemplating repairing your sidewalk investigate the merits of these new lights.
Write, call or phone for particulars.

Mullen Replaceable Vault
Light Company
Fulton Building Phone Grant 2743 Pittsburgh, Pa.

Pittsburgh Daily Post, May 9, 1915