10 Hours a day?
The "Comparative hour/divide" watch is the first decimal division watch of the measurement of time with a comparative and concurrent display on the same dial with two scales of the two types of measuring time.
Chanson David Comparative
- www.chansondavid.com
R. Nienaber Dezimal Zeit, 1 day = 10 hours à. 100 minutes
- www.nienaber-uhren.de
more info for decimal time: wikipedia - decimal time
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