Ruska subsequently worked purposefully to improve the details, and in 1933 he built what can be described as the first electron microscope in the modern sense - an instrument with considerably better performance than a conventional light microscope 's.
(Ruska; worked purposefully; to improve the details; T:subsequently) Context(Ruska worked purposefully,List([0, 38))):(Ruska; worked purposefully to improve; the details) (he; built; what can be described as the first electron microscope in the modern sense; T:in 1933)
Ruska worked purposefully,List([0, 38))
Ruska Ruska he
worked purposefully worked purposefully to improve built
to improve the details T:subsequently
the details
what can be described as the first electron microscope in the modern sense T:in 1933