TY - GEN AU - SPANGENBERG,H D AU - POOL,M L TI - A 65 or a 90 kilovolt x-ray machine? SN - 0030-4220 PY - 1998///1101 KW - Dentistry KW - supply & distribution KW - Equipment and Supplies KW - Radiography KW - X-Rays N1 - Publication Type: Journal Article UR - https://doi.org/10.1016/0030-4220(60)90483-7 ER -