Engineering Drawing
These items typically are not used in new designs, but are still common in high-power amplifiers:

Electron tubes
Switches
Signal relays
Amplifier tubes

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Engineering Drawing
Three dimensional models are often used in the design process to ________.

Help the client select a color for their carpet
Help the client understand the overall design concept
Provide the client with a model which they can use to impress their friends
Determine the quantity of brick needed to build the house

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