(1st)
Cleaning & oiling;  Sealed cracks in BAKELITE COVER ...
(2nd)
Between ACRYL-Window & Base lots of dirt was accumulated. Rivets had
to be removed - replaced by MINI-SCREWS - to get access for cleaning
(3rd)
Consequence:  Cover had to be CARVED-OUT for the new screw-heads ...
(4th)
The MARK of Register "I" (= Input) was missing  -  Now home-made ...

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© C.HAMANN        http://public.BHT-Berlin.de/hamann         05/30/10