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Brief description of the drawings
1a and 1b are plan views of the flat diaphragm and the roll edge, and a sectional view thereof,
FIG. FIG. 4 is a plan view of a corrugation formed at a corner of a roll edge showing one
embodiment of the present invention and its sectional view, FIG. 4 and FIG. It is a measurement
data figure which compared a sound pressure level. In the figure, 10 indicates a roll edge, 10a
and 10b LJ flat portions, and IOC indicates a corrugation portion.