Phone connector (audio) - Wikipedia
The 19th Century plug that's still being used - BBC News
What Size Is A Headphone Jack? (Everything You Need To Know!)
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Differences Between 2.5mm, 3.5mm & 6.35mm Headphone Jacks – My New Microphone
Differences Between 2.5mm, 3.5mm & 6.35mm Headphone Jacks – My New Microphone
Headphone Jack Sizes and Plugs - All You Need to Know - Musician Wave
The 19th Century plug that's still being used - BBC News
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What is the normal headphone jack size? - Quora
What are the Different Sizes of Headphone Audio Jacks? - ElectronicsHub
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Headphone Jack Sizes & Plugs (Complete Guide)
Headphone Jack Sizes & Plugs: Ultimate Guide - Audiosolace
