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Brief description of the drawings
FIG. 1 is a partially cutaway oblique view showing an example of a magnetic circuit of a
conventional ribbon type speaker, FIG. , II, III are inclined views showing the yoke and the pole
constituting the present embodiment at each manufacturing process, FIG. 5 and 6 respectively
show an A-A sectional view and a B-B sectional view of FIG. 1 ... Yoke part, IA ... pole part, 2A ...
long hole, 2A □ ... magnetic gap, 4 ... component material.