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Difference from prior major revision.
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<pre>
[[IEC]]
[[IEEE]]
[[IM]]
[[IMAIN]]
[[Impedance_Bond]]
[[Intercar_Gangway]]
[[Interchange]]
[[Interlocking]]
[[Intermodal]]
[[Inverter]]
[[Island_Platform]]
[[ISO]]
[[Isolation]]
[[Isolating_Cock]]
</pre>