Gregorio Ynciong Zara, Philippine engineer and inventor (Lipa, Batangas 12 March 1902 – 15 October 1978)

Discovered kinetic electrical resistance or Zara effect

INVENTIONS  (about 30 devices and equipments; incomplete)

An  earth magnetic and induction compass (1929)

Two-way television telephone or videophone (1955)

An airplane engine that employed industrial alcohol as fuel (1952)

A semi-automatic propeller-cutting machine (1952)

A sun stove

A solar battery (1960s)

Drinking glass vapor chamber to visualize radioactive elements (1962)

Thermo solar energy machine (1961)

A wooden microscope with a collapsible stage

New designs for a house solar water heater (SolarSorber)

A functional robot

Wooden aircraft propellers (1963)