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It's invisible, man

Letters

During my half century career in civil engineering I had never quite believed in the reality of 'sky hooks'. Having looked at the photograph on pages 22/23 (NCE last week) I am delighted to find that they do indeed exist. I could have used lots of these had I known where to find them.

John M McCall (M), Wellwood, Stockcroft Road, Balcombe Sussex RH17 6LL

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