Thomasville Milo 09410-17 LB Serie Manual Del Usuario página 3

SAFETY WARNING
Use only mattress, which is 37 1/2" - 38 1/2" width and 74" - 75" long for upper bunk (twin size),
53 1/2" - 54 1/2" width and 74" - 75" for lower bunk (full size).