Assertion: ballpoint pen's ink | /r/HasProperty | required in order
Facets:
Source sentences:
text: In 1938, the Hungarian, Laszlo Biro, produced the first proper ballpoint pen, and he was able to do so because he had – having witnessed thick newspaper ink drying quickly at his presses – realised that a thick ink was required in order for the ballpoint pen to ever be a success.