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Creator
- Bausch & Lomb Optical Company7
- Beckman Instruments, Inc.5
- Leeds and Northrup Company5
- Arthur H. Thomas Company3
- Ernst Leitz (Firm)2
- General Radio Company2
- Industrial Instruments, Inc.2
- Minneapolis-Honeywell Regulator Company2
- Rubicon Instruments2
- Sunderman, F. William (Frederick William), 1898-20032
- Weston Electrical Instrument Corporation2
- A.C. Gilbert Company1
- Adam Hilger Ltd.1
- American Optical Corporation1
- Applied Physics Corporation1
- Auer v. Welsbach, Carl (Auer von Welsbach), 1858-19291
- Bendix Corporation1
- Charles Lentz and Sons1
- Coleman Electric Co. (Maywood, Ill.)1
- D. Hedberg Graphic Calculator Company1