Vacuum Tube
Heat Exchanger / Heat Transfer
Boiler / Bearing (Mechanical)
X Ray Crystallography / X Ray
Thermal Expansion / Pipe (Fluid Conveyance)
Amplifier / Equalization (Audio)
Cathode Ray Tube / Printer (Computing)
Chemical Reactor / Electrical Connector
Electrical Connector / Radio
Vacuum Tube / Series And Parallel Circuits
Input/Output / Central Processing Unit
Pump / Electrical Connector
Electrical Connector / Valve
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