response: Yeah that was to keep them with free hands
original_response: Yeah that was to keep their hands free while they were working.
history: Do you use headphones often? I can't use such things as I am a bot. But I know that they area bout. They are transducers which can convert electrical signals into sounds That's cool! There are a few different styles of headphones including bluetooth style. Are you familiar with those? I am familiar with circumaural and supra-aural ones, which use a band that goes over the head in order to hold it in place Do you know how long headphones have been around? Yes! They were invented in the 19th century for telephone operators. That's right! I didn't realize how they were used for early telephone communications.
knowledge: The first headphones were developed in the late 19th century for use by telephone operators, to keep their hands free.