The first modern hearing aid was produced during the 1800s by companies in Philadelphia and Germany. They used technology based on the carbon transmitter and electrical amplification advances of Thomas Edison and Alexander Graham Bell. The first carbon-type hearing aid was developed in 1989 by the Dictograph Company.
The first electrical hearing aid, which implemented usage of a battery and a carbon transmitter, was patented by Miller Reese Hutchison in Alabama. The first hearing aid models before the use of carbon transmitters were large ear trumpets where one end was large, used to collect noise, before funneling into a small tube that fit into the ear.Learn More
Coca-Cola was first produced on May 8th, 1886. It was invented by Dr. John Stith Pemberton, a pharmacist in Atlanta, Georgia who sold it through a local pharmacy for five cents a glass.Full Answer >
According to the US Department of Energy, Thomas Edison and his team had produced a functional incandescent light bulb by October 1879. Before this, British inventors had been experimenting with arc lamps. The first "constant electrical light" was invented in 1835, after which inventors continued to make small improvements until Edison's commercial breakthrough.Full Answer >
The band-aid was invented by Earle Dickson, who was an employee of Johnson & Johnson, and his wife Josephine. His wife was constantly cutting or burning herself and needed to find relief.Full Answer >
The comb is such a basic human tool that historians have no way to know who the inventor of the first comb was. Combs that have been found by archaeologists have been located in settlements from 5,000 years ago in Persia.Full Answer >