[ Ref. 20.10.01 MMDigest ]

It occurs to me that, in Richard Friedman's recent posting of a list of
piano roll manufacturers, the Waterbury Brass Goods Company could have
been the supplier (or even manufacturer) of the 0.003" thick brass
sheet stock for the Tel-Electric player mechanisms.  So its inclusion
in such a list is not fetched so awfully far.

https://www.mmdigest.com/Gallery/MMMedia/telelectric.html 

John Grant