Analysis of information sources in references of the Wikipedia article "Watch" in English language version.
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{{cite book}}: ISBN / Date incompatibility (help)watch clock henlein.
{{cite book}}: ISBN / Date incompatibility (help)There were no hands, instead it featured an LED "time screen" made of synthetic ruby with 27 diodes in each digit that displayed the time for 1.25 seconds when the wearer pushed a button on the front.
{{cite web}}: CS1 maint: deprecated archival service (link){{cite web}}: CS1 maint: deprecated archival service (link)We try to explain why it makes sense to spend $500,000 on a watch.
The display, produced by a complex 25-chip circuit, was so power-hungry that it lit up only temporarily when the user pushed a button on the front of the unit.
{{cite book}}: ISBN / Date incompatibility (help)We try to explain why it makes sense to spend $500,000 on a watch.