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Brief description of the drawings
FIG. 1 is a partially cutaway oblique view showing one example of a conventional flat diaphragm,
FIG. 2 is an oblique view based on an embodiment of the flat diaphragm of the present invention,
and FIG. Fig. 4 is a plan view showing another embodiment of the present invention, and Fig. 5 is
a side view of the same. 1 ... core material, IA ... continuous recess, 2 ... foam member.