411 REFERENCE · Wikibooks
ATRIAS 2.1 Handbook/General Information/Suppliers and Manufacturers/Slip Rings
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Slip Rings
Mercotac
from old beaversource page Conductix
from old beaversource page Rotary Systems
from old beaversource page United Equipment Accessories
We bought a unit(s) from here in 2013