| http://www.w3.org/ns/prov#value | - Thus, the sound waves can be radiated over a wide area of about 180 degrees except for the position or location where the lid-cum-reflector 61 is located.Referring to FIGS. 10 and 11, a mounting ring 71 is mounted and fixed to the support bar 7 at the lower portion of the support bar 7 and at the position slightly higher than the opening 10c.
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