Did the Chinese ever attempt to copy the 707?

From:         Steven Grunblatt <nnygrb@ubss.com>
Organization: UBS
Date:         10 Sep 95 13:26:30 
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I recall reading somewhere that in the 1970s the Chinese government
purchased 2 Boeing 707s. After delivery,Boeing lost track of the
aircraft's whereabouts. It was speculated that the aircraft were
dismantled, and unsuccessfully copied.

Can anyone elaborate?