4 public-domain matches
Tesla Valve
United States patent 1119732 — Apparatus for Transmitting Electrical Energy
United States patent 1119732 — Apparatus for Transmitting Electrical Energy
Canadian Patent No. 135174 — Fluid Propulsion
Canadian Patent No. 135174 — Fluid Propulsion
The Problem of Increasing Human Energy with special references to the harnessing of the Sun's energy