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All brass N.P. 11/2" (37.5 mm.) long to demonstrate principle of archemedes.
All brass N. P. Large 2" (50 mm) long. to demonstrate principle of archemedes

All brass N.P. 11/2" (37.5 mm.) long to demonstrate principle of archemedes.
All brass N. P. Large 2" (50 mm) long. to demonstrate principle of archemedes



