Only One Chance in 20,000,000
The accidental use of the wrong key showed a New Plymouth businessman that the key to the front door of his home could open the door of his office, and that his office key would fit the keyhole in his front door. The keys are of a wellknown type. Each such key and its associate lock are designed differently by making slight but complex variations in such parts as key ways, tumblers, pins and serrations. According to a recognised authority on keys, what has happened at New Plymouth is the mathematical chance of one in 20,000,000.
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https://paperspast.natlib.govt.nz/newspapers/BPB19500911.2.38
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Bay of Plenty Beacon, Volume 15, Issue 94, 11 September 1950, Page 5
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101Only One Chance in 20,000,000 Bay of Plenty Beacon, Volume 15, Issue 94, 11 September 1950, Page 5
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