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Pro-Tech makes a knife that sounds like what you describe: the Ciabatta (http://protechknives.com/knives/switchblades/ciabatta-blackie-colli...)
They call it a spring assisted opening knife. I think the mechanism is similar to the Imperial trick knives, but the blade springs open after you press the blade to disengage the hidden internal catch. It also has a button type lock to hold it open.
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