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18WuD2x

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778 Appendix A<br />

Microphone, directional<br />

Milliammeter<br />

mA<br />

NAND gate<br />

Negative voltage connection<br />

−<br />

NOR gate<br />

NOT gate<br />

Optoisolator<br />

OR gate<br />

Outlet, two-wire, nonpolarized<br />

Outlet, two-wire, polarized<br />

Outlet, three-wire<br />

Outlet, 234-V<br />

Plate, electron-tube<br />

Plug, two-wire, nonpolarized

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