| 摘要 |
A replaceable filter cartridge has a pleated paper filter medium mounted within a frame or casing having a closed side and an open side, the open side being covered by a removable protective tray or lid the internal shape of which has been used in manufacture for moulding a sealing surface onto the periphery of the frame or casing, the closed side of the frame or casing being provided with a perforated portion which is also removable for use of the filter cartridge.
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