Cave paintingPaintings, often prehistoric, on cave walls and ceilings · genre of painting–——
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Cave paintingPaintings, often prehistoric, on cave walls and ceilings · genre of painting–——
WritingPersistent representation of language · skill · hobby–——
Printing pressDevice to apply ink under pressure · product–——
Postal systemSystem for transporting documents and other small packages · service–——
TelegraphLong distance transmission of text · mail–——
TelephoneTelecommunications device · type of physical object · type of product · type of device–——
RadioUse of radio waves for communication · industry · technology–——
InternetGlobal system of connected computer networks · IP network · computer network · invention · wide area network–——Showing 8 of 8