There is a 2 page article by William Braid White concerning whose responsibility it is for broken piano plates.
I've uploaded the August, 1958 PT Journal. See Pages 18-19.
The Tuner Technician Magazine Archive link is
here.
Look in the folder:
Piano Technicians Journals 1958-1978Paul.
------------------------------
Paul Brown, RPT
Past President
Piano Technicians Guild
Vancouver, BC Canada
Email:
ipp@ptg.org------------------------------