-
-
-
3717199
-
Patent number 3,717,199
-
Issue date Feb 20, 1973
-
F28 - HEAT EXCHANGE IN GENERAL
-
1869756
-
Patent number 1,869,756
-
Issue date Aug 2, 1932
-
B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
-
1047997
-
Patent number 1,047,997
-
Issue date Dec 24, 1912
-
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
-
691270
-
Patent number 691,270
-
Issue date Jan 14, 1902
-
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
-
29438
-
Patent number 29,438
-
Issue date Jul 31, 1860
-
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
-
4504
-
Patent number 4,504
-
Issue date May 9, 1846
-
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE