of 46 years of dependable inspection and testing service to
industry.
Founded in 1881 by William Kent and William F.Zimmerman,
 under the firm name of Kent & Zimmerman, mechanical
 engineers, it was later acquired by Capt. A. E. Hunt and
Geo. H. Clapp, who inaugurated the unique service of inspection
 of materials, testing of machinery and metals, and chemical
 analyses—a service upon which the business was built.

Pittsburgh Testing Laboratory Building,
Stevenson & Locust Streets,
Pittsburgh, Pa.

Industry found their services of great value in making
independent inspections and tests, free from all bias or exaggeration,
 and the scientific methods by which they pursued
their investigation soon won the confidence of all industry.
In 1891, it was made a limited partnership under the
name of Pittsburgh Testing Laboratory, Limited, and in
1907 was incorporated under the laws of Pennsylvania.