Дж.Д. Левенталь

The Submarine Mine-Layer

The Submarine Mine-Layer, 1917

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A Submarine Destroyer

A Submarine Destroyer, 1917

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Mechanical Operation of British Tanks

Mechanical Operation of British Tanks, 1917

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The Gasoline Engine

The Gasoline Engine, 1917

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Freak Patents: The Balloon R.R.

Freak Patents: The Balloon R.R., 1917

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Fiske Torpedo Plane

Fiske Torpedo Plane, 1917

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The Aeroplane Machine Gun

The Aeroplane Machine Gun, 1917

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An Engineering Problem

An Engineering Problem, 1916

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