One of the most successful advertising campaigns ever involved doorbells. Anybody that watched TV or picked up a magazine during the 1950's and 1960's will remember images of the cheerful Avon Lady and her signature ringing of the doorbell.
Avon even furnished representatives with novelty mechanical doorbells they could use during sales calls. These sales aides were cleverly adapted door mounted doorbells.
The ubiquitous television commercials featured a melodious "ding-dong" with a long resonance that could only have been produced by long tubular bells.
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