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Members Library
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British Patent Specifications
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German Patent Specifications
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US Patent Specifications
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Press Releases from Yesteryear
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Document Translations
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Books on locks and keys
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On-line Links and Resources
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Never seen a mappins patent with only 4 guards. Odd. It's chicken and egg, I find that the key will not want to go in until it's already cut as the sharp edge on the blank does not move easily...
Is it a Mappin