Facts about Walkmans

1. 06

   Akio Morita, Sony's co-founder, personally demanded that the original Walkman prototype be lightweight enough to fit in a shirt pocket, driving engineers to reduce its size by 40 percent from earlier designs.

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2. 05

   Thirty-three million Walkmans were sold in 1984 alone, representing nearly two-thirds of all portable cassette players on the market that year.

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3. 04

   The Walkman's headphone jack design became an industry standard, with the 3.5mm mini-jack adopted by Sony in 1979 remaining the dominant audio connector for over four decades.

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4. 03

   By 1984, approximately 50 million Walkmans had been sold worldwide, making Sony's portable cassette player one of the fastest-selling consumer electronics devices in history.

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5. 02

   Sony's WM-DD Walkman, released in 1986, featured dual cassette decks allowing users to record from one tape onto another without external equipment.

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6. 01

   In 1979, Sony released the first Walkman, which weighed 14 ounces and could play cassettes for up to 10 hours on four AA batteries.

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