#2056 - 20¢ Edwin Armstrong - inventor
Edwin Armstrong was an American electrical engineer who invented frequency modulation (FM) radio. Prior to FM, broadcasts were conducted as AM radio. FM delivers a much clearer sound, though the signal does not have as far a range. Scott 2056 Edwin Armstrong
| #2056 - 20¢ Edwin Armstrong - inventor | ||
|---|---|---|
| mint $1.50 | Add to Wish List 2056 M | |
| used $0.20 | Add to Wish List 2056 U |
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