[GreenKeys] Teletype Spotting

[Paul Birkel]

Q:  What heavy-metal units are seen in the following photo?

 

https://www.mitre.org/sites/default/files/styles/responsive_large/public/her
o/SATIN-1961.jpg?itok=75shIlSa

 

(SATIN: SAGE Air Traffic Integration; SATIN aimed to develop a single,
unified system for managing the nation's airspace.)

 

Thanks!

 

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