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The Sperry Gyro-Compass 封面
2.6
The Sperry Gyro-Compass Sperry Gyroscope Company Project Gutenberg · 2019 Project Gutenberg was the first provider of free electronic books, or eBooks. Michael Hart, founder of Project Gutenberg, invented eBooks in 1971 and …
U.S. Patent 4,293,314： Gelled Fuel-Air Explosive 封面
1.5
U.S. Patent 4,293,314： Gelled Fuel-Air Explosive Stull, Bertram O. Project Gutenberg · 2019 Project Gutenberg was the first provider of free electronic books, or eBooks. Michael Hart, founder of Project Gutenberg, invented eBooks in 1971 and …