Gem Bids For 1. Thermofisher Scientific Make Anion Column, 064149, Prod, Col, Ip, As 23, 4x250mm, 2. Thermofisher Scientificmake Cation Column, 079805, Prod, Col, Ip, Cs16, 5x250mm., 3. Thermofisher Scientific Make Cation Guard Column, 079931, Prod, Col, Ip, Cg16, 3x50mm