On Apr 3, 12:03*am, Joseph Gwinn wrote:
I'm interested in the electronic levels mentioned in the thread "Surface
plate maintenance (19 March 2009 et seq), specifically the Talyval from
Taylor Hobson. *This is the Mahr unit. *I've been trying to find the
original patents (long expired), but have struck out, probably because
the US Patent Office only has searchable text back to 1976. *I think it
was Jon Elson who mentioned these patents.

What I have found is US Patents 4,023,413 and 5,022,264 from Wyler AG is
Switzerland, a competitor. *This is capacitive, not inductive like the
Talyval unit.

Anyway, does anyone know the patent numbers, or the inventors name? *Or
an article or book reference? *I have found only a number of truncated
references or descriptions, but nothing with real meat on it.

Thanks,

Joe Gwinn