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— Apis ( talk) 00:52, 3 February 2009 (UTC) reply

Hi Inthend9!

Thanks for your recent edits to hyperboloid structure (on their properties, esp. why they work well for cooling towers); I’ve rearranged a little, and corrected one error: hyperboloids are doubly ruled surfaces, and hence do have straight lines on them. In fact, this is the main interest!

—Nils von Barth ( nbarth) ( talk) 11:10, 10 August 2009 (UTC) reply

All I can say to you Nbarth, is thanks. Nice to know there's someone helping out. Inthend9 ( talk) 20:31, 10 August 2009 (UTC) reply

No worries, and glad to have you on board -- happy edition!

—Nils von Barth ( nbarth) ( talk) 22:09, 16 September 2009 (UTC) reply