AN/SGA-3 Teletype Ancillary Equipment
AN/SGA-3 is teletype ancillary equipment for shipborne use which  provides automatic, off-line encryption and decryption of teletype traffic. 

Click here for the AN/SGA-3 data sheet


 
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AN/SGA-3 photo courtesy NSA. 
 

Contributors:

1) Nick England <navy.radio(at)gmail.com>
 

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Feb 27/15