Modern times : timekeeping on its way to the present /
Graf, Johannes,
Modern times : timekeeping on its way to the present / Johannes Graf. - [First edition]. - 39 pages : color illustrations ; 21 cm
3922673198 9783922673194
2006485348
Clocks and watches--History.
Time measurements--History.
Clocks and watches.
Time measurements.
Timekeeper (general) Germany Master slave timezones atomic quartz 20th century modern Catalog electrical electronic History
History.
Modern times : timekeeping on its way to the present / Johannes Graf. - [First edition]. - 39 pages : color illustrations ; 21 cm
3922673198 9783922673194
2006485348
Clocks and watches--History.
Time measurements--History.
Clocks and watches.
Time measurements.
Timekeeper (general) Germany Master slave timezones atomic quartz 20th century modern Catalog electrical electronic History
History.