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Face: | Mihajlo (Michael) Idvorski Pupin (Serbian American physicist). Pupin is known for his numerous patents, including a means of extending the range of long-distance telephone communication by placing loading coils (of wire) at predetermined intervals along the transmitting wire (known as "Pupin coils"). | |
Back: | Telephone Exchange bldg. | |
Signature(s): | ||
Other characteristics: | Color: red, purple, orange and lilac | |
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