Littmann stethoscope

Claim 1

A LENGTWEIGHT COMPACT STETHOSCOPE CHESTPIECE COMPRISING: A BODY FORMED OF A SOLID INTEGRAL MASS HAVING A CIRCULAR APRON WITH TWO OPPOSITE MAJOR SIDE WALLS, ONE SIDE WALL BEING CONCAVE IN CONFIGURATION AND THE OTHER SIDE WALL HAVING A REARWARDLY EXTENDING PROJECTION COAXIALLY FORMED THEREON, SAID PROJECTION DEFINING A STEM PASSAGEWAY, AN ANNULAR EDGE CONNECTING THE PERIPHERY OF SAID SIDE WALLS, A PLANAR CIRCULAR DIPHRAGM COVERING SAID ONE SIDE WALL WITH ITS EDGE TO JOINED TO SAID ANNULAR EDGE, SAID PROJECTION HAVING AN ANNULAR CONCAVE SIDE WALL CONTINUOUS WITH SAID APRON AND A TOP HAVING A PERIPHERAL EDGE COMMON WITH AN EDGE OF SAID ANNULAR CONCAVE SIDE WALL, SAID STEM PASSAGEWAY HAVING AN OUTER END OF SAID CONCAVE WALL, SAID ONE SIDE WALL DEFINING A SUBSTANTIALLY CIRCULAR OPENING AXIALLY ALIGNED WITH A CENTRAL AXIS OF SAID ONE SIDE WALL AND SAID DISPHRAGM WITH SAID CIRCULAR OPENING INTERCONNECTINGS A SPACE BETWEEN SAID ONE SIDE WALL AND SAID DIAPHRAGM WITH SAID STEM PASSAGEWAY, AN ELONGATED STEM SECURED IN SAID STEM PASSAGEWAY DEFINING AN OPENING EXTENDING LONGITUDINALLY THERETHROUGH WITH SAID STEM HAVING ONE END EXTENDING INTO SAID PROJECTION AN ACUTE ANGLE WITH RESPECT TO THE PLANE OF SAID DIAPHRAGM AND TERMINATING IN SAID PROJECTION BEYOND SAID AXIS PASSING THROUGH THE CENTER OF SAID DIAPHRAGM AND SAID ONE SIDE WALL, SAID STEM HAVING A PORTION THEREOF REMOVED FOR ACOMMUNICATION OF SAID STEM PASSAGEWAY WITH SAID SPACE THROUGH SAID FIRST-MENTIONED OPENING.