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Is egg timer a subclass of clock?

No
clock
clock (a timepiece that shows the time of day, typically treated as non-portable)
wikipedia
Egg timer
egg timer, a device whose primary function is to measure a set amount of time
wikipedia
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Is egg timer, a device whose primary function is to measure a set amount of time currently a subclass (child class) of (shares all members with by definition) clock (a timepiece that shows the time of day, typically treated as non-portable)?
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