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One handed and butterfly-like in operation. This design is the result of several stages of development: mechanical models built from wood, acrylic and metal, and form refinement through sketch models and design drawing. The final two designs were sandcast in aluminum and machined on a Bridgeport mill. The surviving design is shown.
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One handed and butterfly-like in operation, the blade is secure in the extended or retracted position. This design is the result of several stages of development: mechanical models built from wood, acrylic and metal, and form refinement through sketch models and design drawing. The final two designs were sandcast in aluminum and machined on a Bridgeport mill. The surviving design is shown.

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