| 摘要 |
A device including at least one elongate slot having an elongate blade or vane secured therein, in which the slot when viewed in transverse cross section is curved and the blade or vane is resilient and normally flat in its unstressed condition out of said slot and has a portion securely locatable in said slot by the reactive pressures resulting from deformation of said portion to assume the curve of the slot when located therein.
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