Here are 2 types of mortise gauges with different patent.
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This one has the same concept like David Barons marking gauge. Simple and easy to make but usefull to. Walnut and oak.
http://www.davidbarronfurniture.co.u...asp?pg=1&id=18
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Also I came to an idea for this simple mortise patent. Needs just a little shaping. Cherry and oak.
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