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David Williams from Canada calculated that the size of the ideal parabolic dish for solar...
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|current||08:05, February 12, 2008||1,417 × 1,483 (88 KB)||Gaiatechnician (Talk | contribs)||a timer for solar tracking|
|06:10, February 12, 2008||1,417 × 1,483 (110 KB)||Gaiatechnician (Talk | contribs)|
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