Over the past 50 years, Chickasha-based HSI Sensing has developed a wide array of new applications for a technology invented in the 1930s by a Bell Laboratories engineer. It is called the reed switch.

CEO Ryan Posey was deep into the story recently of how his grandfather, the late William Posey, founded HSI Sensing in 1968 when a question interrupted the monologue.

“What's a reed switch?”

Posey patiently explained that a reed switch consists of two pieces of metal sealed in glass, designed to open and close an electrical circuit.

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