Inventions

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01. The headphone jack we use today was invented back in the 19th century. The larger version of the phone connector was invented for use in telephone switchboards in 1878. Its design has remained unchanged except for its size. The original 1/4″ design is still standard on a lot of audio equipments. Things I Didn’t Know I Needed, Cool Inventions And Gadgets, Odd Facts, Unusual People, Vintage Toys 1960s, Fact Republic, Female Hysteria, Clever Gadgets, Retro Gadgets

01. The headphone jack we use today was invented back in the 19th century. The larger version of the phone connector was invented for use in telephone switchboards in 1878. Its design has remained unchanged except for its size. The original 1/4″ design is still standard on a lot of audio equipments.

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