From Alloy Artifacts:
Bergman Tool Manufacturing Company
The Bergman Tool Manufacturing Company was founded in Buffalo, New York during the early part of the 20th century. The company was a maker of adjustable wrenches, pliers, and possibly other tools, and their products were sold under the Bergman, "Queen City", and "Blue Bird" brands.
In 1927 Bergman Tool filed a trademark application for "Blue Bird Tools" in a design showing a bird in the center. The application listed the company address as 1573-1576 Niagara Street in Buffalo, and their products were listed as tinner's snips and hand shears. The trademark was issued as #230,677 on August 2, 1927. The members of the firm at this time were Caroline E. Bergman, Jerome E. Bergman, and Ray W. Kempner.
In 1956 the company filed a trademark for "BLUE BIRD" as block text (no design), with the company's products listed as tinner's snips, battery service tools, and pliers. The trademark was issued as #629,907 on July 3, 1956. This trademark was renewed as recently as 1996, and the company's address is given as 8400 Lakeview Parkway in Kenosha, Wisconsin.