Invention
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computer
class
general-purpose device for performing arithmetic or logical operations
Wehnelt cylinder
class
electrode in the electron gun assembly of some thermionic devices
Fultograph
class
an early image transmission system, similar in function to fax machines
Perspecta
class
1950s movie sound system
Chronomégaphone
class
sound-on-disc cinema sound system employing compressed air gramophones
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