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The push button's history is more fascinating and important than you can imagine: Here's why
“Concerns revolved around whose finger would be on the button ... continued when Bell Telephone introduced the push-button telephone in 1963, gradually supplanting the previous pulse-dialing ...
Electronics Weekly1y
Harvesting push button powers electronics from your finger
Gemns G100 is the latest finger-powered energy harvester from WePower Technologies – in this case, a push-button with built-in wireless IoT sensor node. Around 40mm in diameter and 70mm from end to ...