When were bar codes invented?

Answer The concept of a bar code dates back to the early 20th century, but did not take shape for many decades. The patent for the technology that the bar code is based upon was granted in 1949, and the f... Read More »

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When were cell phones invented&who were they made by?

Martin Cooper invented the cell phone in 1973, and Motorola was its maker. The phone was much bigger and heavier than today's models. Called the DynaTAC, the phone did not go one sale until 10 year... Read More »

When were bar codes first used?

In 1948, Bernard Silver, a graduate student at Drexel Institute of Technology in Philadelphia made the first step in the use of bar codes. Silver and Norman Joseph Woodland, a twenty-seven-year-old... Read More »

When was the technology to read bar codes invented?

The U.S. Patent for bar codes was filed in 1952, but the technology took two decades to perfect. One of the first UPC scanners, made by NCR Corp, was installed at Marsh's supermarket in Troy, Ohio ... Read More »

When were air brakes invented?

George Westinghouse, designed and developed the first air brakes for trains. He founded the Westinghouse Air Brake Company in 1869. The air brake entered widespread use when made compulsory on all ... Read More »