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							oshpark
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							The minimum specs for 4 layer orders are 
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							5 mil (0.127 mm) traces with 5 mil (0.127 mm) spacing, 
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							and 10 mil (0.254 mm) drills with 4 mil (0.1 mm) annular rings.
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							seeedstudio
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							minimum drill hole: 0.2 mm width
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