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The invention of a shovel with a wheel
pencil and a slide rule on the old page with the calculations in mechanics
Vintage drawing of a Gasoline twin pistons boat engine from the beginning of 20th century - Picture from Meyers Lexikon book (written in German language) published in 1908 Leipzig - Germany.
Driver. Imaginary race
Symbolic composition. Money and bar code, light bulbs represents business ideas. 3D rendering
Helio-Gyro-Copter invented by Jesse D Langdon The propeller and its wide circular rim act both as a gyroscope and a rotor.

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