April 1921 Electrical and scientific apparatus Trademarks by day
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|
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| 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| 24 | 25 | 26 | 27 | 28 | 29 | 30 |
Electrical and scientific apparatus Trademarks filed in April 1921
RADIOTRON
Filed: April 28, 1921
ELECTRICAL VACUUM TUBES AND VALVES
Owned by: RADIO CORPORATION OF AMERICA
Serial Number: 71146930
INGERSOLL-RAND
Filed: April 26, 1921
[ STEAM-ENGINES, ] STEAM TURBINES, TURBO-COMPRESSORS, TURBO-BLOWERS, TURBO-EXHAUSTERS, RECIPROCATING COMPRESSORS, [ PORTABLE…
Owned by: INGERSOLL-RAND INDUSTRIAL U.S., INC.
Serial Number: 71146768
PHOROPTOR
Filed: April 25, 1921
Eye-Testing Instruments for Testing the Refractive Media and Motor Muscles of the Eye
Owned by: Reichert, Inc.
Serial Number: 71146698
RAY-O-VAC
Filed: April 25, 1921
Dry-Cell Batteries
Owned by: Ray-O-Vac Corporation
Serial Number: 71146704
