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Brief description of the drawings
FIG. 1 is a front sectional view of a conventional electromagnetic acoustic transducer, FIG. 2 is an
enlarged view of a surface portion for explaining the same problem, and FIG. 3 is a front
sectional view of an electromagnetic acoustic transducer according to the present invention. FIG.
4 is a front sectional view of the other embodiment. 3 ··· Iron core constituting the magnetic pole,
6 · · · diaphragm, 7 · · · ballast · i · · · contact point, mouth · · · recessed portion.