1. the impression of bar codes on letters is considered to be one of the basic methods of achieving mechanization in the post service.
2. the load is a resonant circuit tuned to the frequency of the signal applied to the input of the stage, this resonant circuit being either a single tuned circuit or a band-pass filter.
3. radio frequency amplifiers in which single-tuned circuits serve as a load are known to be tuned amplifiers.
4. visual communication allows misunderstandings to be instantly corrected.
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