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Connecting tube with connector and stopcock

Connecting tube with connector and stopcock

Connecting tube with connector and stopcock

Connecting tube with connector and stopcock

Connecting tubing, one with glass connection

Connecting tubing

2 connecting tubes with connectors and stopcocks

Two connecting tubes with connectors and stopcocks

Connecting tube, with one straight and one right-angled glass tube linked by length of rubber tubing. From ureameter set in cardboard case by Parke, Davis and Co, American, c. 1900.

Connecting tube, rubber and glass, from ureameter set by Parke, Davis and Co

1890-1910