Electrical and scientific apparatus Trademarks Filed in March 7, 1949
PR
Filed: March 7, 1949
TESTERS USED ON EXPOSURE METERS AND PHOTOELECTRIC COLOR TEMPERATURE METERS
Owned by: PHOTO RESEARCH CORPORATION
Serial Number: 71575015
SPECTRASPHERE
Filed: March 7, 1949
OPTICAL LENS ATTACHMENT FOR A COLOR TEMPERATURE METER TO INDICATE THE PROPER FILTER TO BE USED WHEN DEALING WITH MIXED LIGHT…
Owned by: PHOTO RESEARCH CORP.
Serial Number: 71575016
