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A polite ringing that signals either dinner with friends or strangers selling you something.

first electricInvented by Joseph Henry around 1831
video eraModern doorbells now film, record, and call your phone
ding-dongTwo-tone chime mimics two notes, often E and C
prank classicDing-dong-ditch ringing then fleeing is centuries old
battery breedWireless versions skip wires entirely, run on batteries
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