With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The French Revolution took place along the borders of France and Germany.
text_B: The Kodak verifax , is a photo copying approach that uses a wet colloidal diffusion transfer technique patented by Yutzy , H.C. and Yackel , E.C. -LRB- 1947 -RRB- The light source is projected to the top crossing the negative being reflected - more or less , according to the color - against the original to be copied exposing the negative .. Has a base that contains the recipient with the liquid developer and the exposure Timer .. liquid developer. Photographic developer. Timer. Timer. Due to its extreme simplicity was widespread until the late 60 's , when it was surpassed by the popularity of the xerocopies using plain paper .. xerocopies. Photocopy. Copies had some chemical smell and lost contrast over the time .
not_related.