does not apply to "technology" for high electron mobility transistors ( HEMT) operating at frequencies lower than 31.8 GHz and hetero-junction bipolar transistors (HBT) operating at frequencies lower than 31.8 GHz. Hetero-structure semiconductor electronic devices such as high electron mobility transistors ( HEMT), hetero-bipolar transistors (HBT), quantum well and super lattice devices Note 3.E.3.b.
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