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Stopper assembly

Image Number 3 for United States Patent #3991896.

A reagent tube and stopper assembly comprising in combination a cylindrical receptacle for containing a clot timing test reagent solution and a flexible stopper for closure thereof and dispensing a spherical member into said reagent solution by depressing a probe into an upper cavity in said stopper and against a thin membrane separating a lower sphere containing cavity in said stopper.

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