Holmes Detective Bureau Advertising Ruler,
Pictured above is an advertising ruler from the Holmes Detective Bureau, Inc. which was established in 1928. The ruler was likely made sometime in the 1980's. Holmes Detective Bureau may be the oldest private investigative agency in the country since it was established in 1928 and is still in operation today.

From The Ralph D. Thomas PI Vintage Collection
THOMAS INVESTIGATIE PUBLICATIONS, INC.
NATIONAL ASSOCIATION OF INVESTIGATIVE SPECIALISTS, INC.
SPY EXCHANGE AND SECURITY CENTER
P O Box 82148, Austin, Texas 78708
Showroom: 9513 Burnet Road, Austin, Texas 78758
Phone 512.719.3595 Fax 512.719.3594
Email: RThomas007@aol.com

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Copyright: 2006, Thomas Investigative Publications, Inc. All rights reserved.
Thomas Investigative Publications, Trademark, 1981.
National Association Of Investigative Specialists, Inc, Trademark, 1986.
Spy Exchange, Trademark, 1999