Assertion: semiconductor's type | /r/HasProperty | developed
Facets:
Source sentences:
text: The very first point-contact transistors used metal cartridge-style packages with an opening that allowed adjustment of the whisker used to make contact with the germanium crystal; such devices were common for only a brief time since more reliable, less labor-intensive types were developed.
text: Finally, a new type of interface has been developed, that was not applied to heterojunction solar cells so far.