When were lie detectors invented?

Answer The first lie detector was invented by Cesare Lombroso in 1895. This device, named plethysmograph, was very different than the polygraph used today. The plethysmograph simply monitored blood flow a... Read More »

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When were smoke detectors invented?

The first battery-operated residential smoke detector was invented in 1967 by Duane D. Pearsall of BRK Electronics. The company went on to develop and market the First Alert brand of smoke detector... Read More »

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 »

Who invented smoke detectors?

Francis Robbins Upton and Fernando J. Dibble invented the first automatic electric fire alarm in 1890. In 1967, Duane D. Pearsall invented the first affordable smoke detectors that could be used i... Read More »

Who invented radar detectors?

Dale Smith invented the first radar detector in the early 1970s due to a nationwide speed limit reduction initiated by the Arab Oil Embargo. The first radar detector was called the Fuzzbuster.Refer... Read More »