| 摘要 |
PCT No. PCT/DE85/00512 Sec. 371 Date Jun. 24, 1986 Sec. 102(e) Date Jun. 24, 1986 PCT Filed Dec. 9, 1985 PCT Pub. No. WO86/03421 PCT Pub. Date Jun. 19, 1986.Accessory device for a gas balloon having, bounding its interior, an inflatable balloon envelope (1) on which is constructed a balloon neck (1a) for inflation of the balloon envelope (1). According to the invention, there is on a sealing head (2) adapted to be inserted in sealing-tight fashion into the balloon neck (1a) a sound irradiating device (20) such as a loudspeaker for irradiating sound into the interior of the gas balloon (FIG. 1).
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