English: A Heatmaster Crackerjack nutcracker. This one thought to have been manufactured in the 1960s. It works by squeezing the handle which compresses the cradle in which the nut is held. A ratchet allows the handle to release while holding the pressure on the nut and the handle can then be squeezed again until the nut breaks. It has accurate pressure application to the nut so the shell does not 'explode'. The cradle can be pulled down to take the next nut by the small stub visible on one side of the cradle.
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