| 摘要 |
474,354. Stoppers. HANS, J. F. (Vereinigte Aluminiumfabriken Ristau, Pieper, & Co., Ges.) May 25, 1937, No. 14498. [Class 125 (iii)] In a stopper for a microbiological culture glass tube, of the kind comprising a cap c and strong springs which engage the inside of the tube, springs are provided with bearing surfaces, of softer material than that of the springs, for engagement with the tube. Bowed leaf springs p, of soft, rustless chromium steel, or alloy, or rubber, engage in notches n, o, in four leaf springs h of hard chromiumnickel steel which radiate from a central plate i secured between a washer f and disc k threaded on the reduced portion e of a handle d.
|
