Did you know that black Americans or African-Americans are responsible for thousands of inventions that make life so much easier in the United States of America? If not, this informative book will introduce you to more than 40 great African-American inventors from the 19th to 21st centuries in America who are responsible for such inventions as: the imaging x-ray spectrometer machine, tracking software application, apparatus for ablating and removing cataract lenses, railway signals, ironing boards, home security system utilizing television surveillance, image converter for detecting electro-magnetic radiation / ultraviolet camera and spectrograph, capillary liquid fuel nuclear reactor, electric switch for railroad, street letter box, apparatus for melting snow, the guitar, apparatus for handling corrosive acid substances, ticket dispensing machines, thermostat and temperature control system, printing press, fire extinguisher, lubricator for steam engines, automatic elevator doors, gas mask, automatic traffic signal, traffic data processing system, casket lowering device, insect destroyer, traffic signal for automobiles, urinalysis machine, transmission and shifting for automobiles, automatic safety brake system, apparatus for automatically recording telephone messages, apparatus for automatically transmitting messages over telephone line, propeller for vessels, hair-care products and beauty cosmetics, and many more!