Blades in folding knives can be opened in many ways, but those that are opened by a gear mechanism are among the more interesting types. Shown within are three German-made folding knives that use gears in the form of a rack and pinion system to open the blades. Each knife has a lever of some sort which must be pulled and pushed to both open and close the blade. The levers have teeth which interact with teeth on the back of the blade and work like any others gears that mesh together. This is actually quite an old mechanism as used on knives which have patents dating back to 1908. These types of gear driven blades were produced in at least three different countries including England, the United States, and Germany as shown. Of the three German models shown, one is marked “Made in Germany”, a second is marked “Solingen Rostfrei”, and the final one is marked “Giesen & Forsthoff Solingen”. These knives have interesting graphics on the handles which were certainly meant as tourist or commercial advertising models. The two smaller variations have celluloid handles, while the larger one has steel handles. All are clever and fun knives.
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