| 摘要 |
A stethoscope having a chest-piece which is composed of a base member fixed to flexible tubes, a pickup mounting member rotatable about a first axis relative to the base member, and a plurality of pickups carried by the pickup mounting member. The plurality of pickups consist of one diaphragm and one bell; the diaphragm and the bell extend in diametrically opposite directions perpendicular to the first axis and extend along a common axis of symmetry; the bell has an outer end which lies in a first plane remote from the first axis, an inner end between the outer end and the first axis and a curved wall between the outer and inner ends; and the outer end has an external diameter less than 30 mm.
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