Assertion: transistor | /r/ObjectUse | used in product
Facets:
value: such as hearing aids
type: OTHER
value: by 1953
type: TEMPORAL
Source sentences:
text: By 1953, the transistor was being used in some products, such as hearing aids and telephone exchanges, but there were still significant issues preventing its broader application, such as sensitivity to moisture and the fragility of the wires attached to germanium crystals.