131. Which company invented the hard drive?
132. Who invented printed circuit board?
Stanislaus F. Danko
133. In which year, the rubber balloon was invented by Michael Faraday?
134. Who invented breakfast cereal?
Henry Parsons Crowell
James Caleb Jackson
135. Who is the inventor of headphones?
John C. Koss
Lee De Forest
136. Who is known as the father of the Java?
137. Who is regarded as the inventor of the safety pin?
Charles B. Brooks
138. Who discovered positron in 1932?
Carl David Anderson
139. Who discovered proton?
J. J. Thomson
140. Who invented the english version of Concertina?
Sir Charles Wheatstone
Carl Friedrich Uhlig
Carl F. Zimmerman