Yeah you're probably right on the manual handcrank jobs still working fine after 100 years. My grandmother is still using her mothers 1950's automatic rising/lowering toaster and still works perfectly, though I did have to get some german solder(silver/tin/flux) to fix on element on it about 5 years ago for her. And every toaster I've owned in the last few years dies out after a few years, or starts to burn toast.
-- "For every human problem, there is a neat, simple solution; and it is always wrong." --H.L. Mencken