There is a difference between Bells and Bellsets. A bell consists of a bell ringer mechanism only and this may be an open type bell or enclosed within a case. A Bellset consists of a bell ringer mechanism plus addition items of equipment (could be anything from a relay to capacitors and can include switches).
The diagrams for Bell, Bellsets, Buzzers and hooters are in the N500 - N599 range. In general prefix a Bellset number with 5. e.g. Bellset No 48 is diagram N548.
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