US researchers invent first battery-free cellphone. IN News.

Sonraí bibleagrafaíochta
Foilsithe in:	Manila Bulletin Ja-D, Mon-Sun (2017).
Formáid:	Alt
Teanga:	English
Ábhair:	Inventions. Cellphones.
Rochtain ar líne:	http://dspace.engglib2.upd.edu.ph/jspui