1. 

   PSG

   
   
   Top one is the old one, bottom is new. The top one has two extra spades on the outside of the socket part. What are these for or what is the difference?
   
   @davidoft

    

   PSG, Dec 23, 2015

   #1
2. 

   snotty

   https://www.type4.org/manuals/ba4_bulletins/1975_Dec_08.html

    

   snotty, Dec 23, 2015

   #2

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