Charles Steinmetz and Curve on Graph (United States of America 1983)

21 September (United States of America ) within release American Inventors Issue goes into circulation Stamp Charles Steinmetz and Curve on Graph face value 20 United States cent

Stamp Charles Steinmetz and Curve on Graph in catalogues
Michel:	Mi:US 1653
Stamp Number:	Sn:US 2055

Stamp is square format.

Also in the issue American Inventors Issue:

• Se-tenant - American Inventors Block of 4 face value 20;
• Se-tenant - American Inventors face value 4*20;
• Stamp - Charles Steinmetz and Curve on Graph face value 20;
• Stamp - Edwin Armstrong and Frequency Modulator face value 20;
• Stamp - Nikola Tesla and Induction Motor face value 20;
• Stamp - Philo T. Farnsworth and First Televison Camera face value 20;