Call volume eventually grew so fast that it was feared the telephone system would consume all electricity production, prompting Bell Labs to begin research on the transistor.
Telefonikõnede hulk kasvas lõpuks nii kiiresti, et kardeti telefonide süsteemi poolt kogu toodetava elektrienergia äratarbimist, see sundis Bell Labsi alustama transistoride uuringuid.