Without looking it up, what is a "silent key"?

 Methodist Chapel, Welsh End, Shropshire
(Click on an image for a larger version)

The Primitive Methodists built this chapel in 1859 to replace an earlier one built in 1828. It is still in use today and has its own burial ground attached.
A Silent Key is a Radio Operator who has passed away and can no longer be heard on the air waves around the world. 
Visited - October 2013

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