> I've seen lots of Slo-Blo fuses in old jukeboxes and pinball machines
> (which have to endure a lot of voltage spikes from the relay-based
> "logic" circuitry) and they all have a type of spring-biased element
> in them. Is the thin/thick element type a newer design?
Well, if I'm picturing the thin/thick element that everyone else is, where
the fusible material is a flat metal blade that's wide on the ends and
narrows down in the center, then no, it's not terribly new. I suspect
they're made that way for easier assembly and better reliability: the wide
ends can probably be handled by machines used in the assembly process, and
the larger surface area of solder at the end caps results in a mechanically
stronger joint, so the fuse won't fail from vibration.
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