| 摘要 |
The elastic band is fixed to the latch (2) and launch support (5), passing over the band support (4) covered in frictional material. The support has semicircular or semi-oval circumference of length approximately equal to the unextended band length. The band has differential tension caused by the action of depression of the trigger (3). On release the band is launched with rotation which produces the returning boomerang effect on contact with the ground
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