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Mullen Replaceable Vault Light Company
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Mullen Replaceable Vault Light Co letterhead

Location:

Mullen Replaceable Vault Light Company lens No. 10, embossed MRVL Co. Mullen Replaceable Vault Light Company lens No. 20
Lens No. 10
"M R V L Co."
Lens No. 20
  • Fulton Building, Pittsburgh, PA
    General Offices, Hartje Building

Timeline:

  • 1914-1922-?

History:

Patents:

Identifier Mon DD Year Inventor(s) Patent Title
US 1,081,979 Dec 23 1913 Mullen, L. G. Transparent Pavement
US D45,123 Jan 6 1914 Mullen, L. G. Design for a Prism-Lens
CA 158,484 Oct 20 1914 Mullen, L. G. Transparent Pavement
GB 1,147 Jul 1 1915 Mullen, L. G. Glass Paving Blocks
FR 477,642 Nov 3 1915 Mullen, L. G. Pavé en verre
US 1,180,412 Apr 25 1916 Mullen, L. G. Transparent Pavement

Gallery:

Bill Mullen, grandson of founder Leo,
provided the following photos and scans:

Sales Kit Items
MRVL Co sales kit items MRVL Co sales kit items MRVL Co sales kit items MRVL Co sales kit items

MRVL Co sales kit items MRVL Co sales kit items


MRVL Construction Pictures
Mullen Replaceable Vault Light Co construction Mullen Replaceable Vault Light Co construction Mullen Replaceable Vault Light Co construction


Completed MRVL Installations
Mullen Replaceable Vault Light Co canopy (skylight) installation Mullen Replaceable Vault Light Co vault light installation

Paper:

Threads:

The metal threads were apparently made by the American Spiral Spring Company American Spiral Spring Company
"Pittsburg and the territory immediately about it make up the greatest centre of iron and steel manufacture in the world, ad the unsurpassed natural advantages enjoyed, and the high skill attained by the men engaged in this industry with the vast superiority of the great plants which have been established by the investment of immense capital, are assurances that the district will retain its supremacy in this important field. The production is no longer confined to steel in bars or ingots, or other forms of raw steel, but the energy of local enterprise has advanced to the manufacture of a variety of steel products—pipe, tools, wire, springs, etc. One of the most valuable and useful forms of steel manufacture is that of spiral springs, and in this important special industry a great advance has been made. In this connection special attention is commanded by the works of the American Spiral Spring Company, and the enterprise and skill displayed by the proprietors and managers. These works are located at Shingiss and Bluff Streets, and while not the largest in the district, are worthy of particular attention, because of their growing business, and because they illustrated the fact that despite the tendency to combination and concentration and monopoly, which is too common in this district, there is still a field for individual enterprise. The American Spiral Spring Company was organized May 1st, 1889, by Messrs. Jas. F. Larkin [superintendent] and John Pfeil [general manager], both of whom had the advantage of a long practical experience in the manufacture of spiral springs. Mr. Larkin had been in the business since his boyhood, a period of twenty-five years, and Mr. Pfeil had an experience of twenty years. With the savings from their earnings they started an independent business, and beginning in a modest way their business has steadily grown. They make springs of the best quality, using the very best steel and taking the greatest care in their manufacture and the uniform high quality of their product has given it the highest standard. They make all kinds of spiral springs, also flat spring keys. These springs are used on locomotives, railroad cars, electric cars, and by manufacturers of agricultural implements. They are shipped south to New Orleans, east to Massachusetts, and west to the Mississippi. Liberality and just dealing have always characterized the business transactions of this company, and under its present able management its future prosperity is assured." —Allegheny County, Pennsylvania; illustrated