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USA.
US manufacturer/reseller of slide rules. Also known as Charles Bruning.
The instruction manual for the 2401 lists the following offices:
- New York, New York
- Newark, New Jersey
- Boston, Massachusetts
- Pittsburgh, Pennsylvania
- Detroit, Michigan
- Chicago, Illinois
- Milwaukee, Wisconsin
- St Louis, Missouri
- Kansas City, Missouri
- Houston, Texas
- Los Angeles, California
- San Francisco, California
- Seattle, Washington
- Birmingham, Alabama
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