| 摘要 |
To retain a discharge vessel 1, a groove 12 is formed in a re-entrant portion 3 of the vessel. The grooves 12 engages a corresponding notch 13 in a coil former of a coil assembly 6, housed in the re-entrant. The coil former is sufficiently resilient to be deflected by the groove as the vessel 1 is pushed onto the former. The arrangement may have means to prevent the vessel rotating about the coil assembly.
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