Masolle 1921
Joseph Masolle, Hans Vogt and Josef Engl assignors to Tri-Ergon Ltd., of Zurich, Switzerland "Electrostatic Telephone"

Masolle 1921

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Filed: November 28, 1921
U.S. Patent 1,550,381
Granted: August 18, 1925

Joseph Masolle, Hans Vogt and Josef Engl assignors to Tri-Ergon Ltd., of Zurich, Switzerland
"Electrostatic Telephone"

Referenced by Walker and Williamson in
U.S. Pat. 3,008,014.