Time and date stamping machines; time clocks being time recording devices; safety helmets; laboratory apparatus and instruments, namely, microscopes, apparatus for measuring the charge-to-mass ratio of an electron, and electrolysis apparatus for laboratory use; chemistry apparatus and instruments, namely, laboratory glassware; apparatus and instruments for physics, namely, prisms for scientific purposes, cloud chambers being particle detectors for observing radiation tracks, spark timers for ...

Optical apparatus and instruments, namely microscopes