| 摘要 |
Bare electrical conductors (4a,4b) are wound helically on a supporting rod (1) and maintained in place by threading through a braided rod surface composed of interwoven, insulating, water resistant filaments (3) . The spacing between the bare conductors is adjusted according to the size of the birds to be repelled and an intermittent very high potential difference (7-10kv) is applied between them
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