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Old 17-01-21, 03:24
Grant Bowker Grant Bowker is online now
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Join Date: Jul 2006
Location: Ottawa, Canada
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60~ might be for 60 Hz current (as opposed to 50 Hz that I believe was/is more common in Europe).

Standardization of frequency in the transmission grid seems to be more recent than I originally thought. Looking at Wiki, it states that parts of southern Ontario were on 25 Hz until at least 1946.
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