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1 Digital Bird Repeller" makes use of bionic technology and electronic technology to reach the purpose of repelling birds by simulated sound."

2 A sudden topological change of a strange repeller happened after a hole-induced crisis is reported.

3 The Mega-Sonic Scatter-Cat Repeller looks like a megaphone because it actually is one.

4 Objective To determine the indoor effects of the auto-sensing acoustooptical rodent repeller placed on a ship rope for further research and application.

5 The rod structure has miniature radio receiver, electronic mosquito repeller, electronic lamp, air cleaner and quartz watch set up in sequence.