 |
What: stamp
Type: United States airmail 7/10/1973 11c multi issue=Progress in Electronics d=two De Forest audions unwmk perf=11 State: used Visibility: public Owner: Stan Shebs |
Creation date unknown |
| |
What: stamp
Type: United States airmail 7/10/1973 11c multi issue=Progress in Electronics d=two De Forest audions unwmk perf=11 State: used Visibility: public Owner: Stan Shebs |
Creation date unknown |