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Buckling spring
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==Image gallery== <gallery mode="packed" style="text-align:left"> File:Bucklingspring-animation-300ms.gif|Buckling spring on key press and release File:Bucklingspring1-o.svg|Illustration from the original buckling spring {{US patent|4118611}}, issued to IBM in 1978 File:IBM buckling spring.svg|A drawing included in the patent for the buckling spring mechanism File:Fig 2 harris keyforce-o.svg|Graph of key force over key travel for a buckling spring key. Visible in graph position 1C the fast force drop when the spring buckles. {{US patent|4118611}}, issued to IBM in 1978. File:Buckling spring comparison.jpg|IBM Model F (left) and Model M (right) keyboard springs </gallery>
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