when using the liquid nitrogen from tanks in room 402A (groups Eklund/Manninen/Vainio/Wei), PUT A REFILL-LABEL ON THEM WHEN THE TANKS ARE EMPTIED! Only
those tanks that have the label are filled up, and that only happens once a week, so if you don't put the label on you and your precious samples will have to manage without nitrogen.
Please always check the situation when using nitrogen and teach all new employees and students to obey this rule, too.