Check the listing for details. Vintage Western Electric Relay Dust Covers Bell System. Condition: Used. Listed at 65.00 USD. Up for sale is a set of six relay dust covers / cylinder shells. However, 125 type relay covers had a hole in the top end and a nut to secure it. I was able to find what looks like this cover in the Bell System Practices for the 209 polar type relays.
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