16.8 Why Do We Need Engineering Symbols? 529
G natural gas line
resistor
capacitor op-amp
speaker logic symbol (and)
logic symbol (or)
gate valve
90° elbow 45° elbow
globe valve
check valve
E electric service
Point of Beginning (POB)
■Figure 16.31 concrete glass
Engineering symbols and signs
provide valuable information.■Figure 16.32
Examples of traffic signs.62080_16_ch16_p504-549.qxd 5/22/10 12:31 AM Page 529
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