That is why I thought of reed switches...
But some other parts come up:
NTC Thermistors
Fuses (found fuses that were just glass tubes sealed
Capacitors (was surprised to learn about hermetically sealed tantalum capacitors in a glass tube)
Diodes (the good ol' 1N914 is a classic glass packaged diode from the early days)
High voltage resistors (Frank S mentioned this one)

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