[GreenKeys] what is a trepac teleprinter relay model 530b I found growing in a model 14!?

[COURYHOUSE at aol.com]

odd more  14  keyboard strip printer what is a  trepac  teleprinter relay 
model 530b I found growing in a model 14!?
 
the model  14  tape printer  has a plug  with 3 slant  prongs  ( not a 3 
wire like today outlet)
 
in addition  there is a  single  1/4 plug 
 
the bell is  up  front of the mech... not on the   side.
 
any ideas? thanks  Ed#
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