Long before the SR-71 Blackbird captured the world’s imagination, its secret predecessor, the A-12 Oxcart, flew faster and higher. -Developed in secret by the CIA at Area 51, the A-12 was a Mach 3+ ...

Determination of seeder power source scheme (1) A garlic seeder equipped with an independent power source, such as an engine or an electric motor, can be fully self-propelled and perform both movement ...