The active compression-decompression device was developed to improve blood flow from the heart
scientists
In China in 1960
The first calculating device called ABACUS was developed bye the Egyptian and Chinese people
You could be thinking of the abacus.
Alexander Graham Bell
Bessie Blount Griffin invented a device which let amputees feed themselves.
BRAKES: It is device which to stop or to retard the motion of the vehicle without skidding and converting kinetic energy into heat dissipation. DYNAMOMETER: It is the device which measure the power developed by the vehicle or torque developed by the vehicle. This is done by utilizing the amount of heat developed during the breaking of the vehicle.
abacus
Palm Taxi
Palm taxi
Palm Taxi
Sony PlayStation is manufactured and developed by SONY. This is a gaming device. It supports a DVD and internet connection. You can buy it online at www.amazon.com