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there is not an exact date but the doorbell helped people be notified that someone is at there household.
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not an exact date, the sewing machine helped make it easier for people to create clothes faster.
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not an exact date, the fire alarm was used to notifiy the fire department of fires at a house.
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Not an exact date, it was created to make it easier to beat eggs faster and better.
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not an exact date but was created to make it cooler for hot summer days.
