-
3797568
-
Patent number 3,797,568
-
Issue date Mar 19, 1974
-
F28 - HEAT EXCHANGE IN GENERAL
-
1931247
-
Patent number 1,931,247
-
Issue date Oct 17, 1933
-
F28 - HEAT EXCHANGE IN GENERAL
-
1810712
-
Patent number 1,810,712
-
Issue date Jun 16, 1931
-
F28 - HEAT EXCHANGE IN GENERAL
-
1808605
-
Patent number 1,808,605
-
Issue date Jun 2, 1931
-
F28 - HEAT EXCHANGE IN GENERAL
-
1796658
-
Patent number 1,796,658
-
Issue date Mar 17, 1931
-
F24 - HEATING RANGES VENTILATING
-
1771812
-
Patent number 1,771,812
-
Issue date Jul 29, 1930
-
F28 - HEAT EXCHANGE IN GENERAL
-
1764187
-
Patent number 1,764,187
-
Issue date Jun 17, 1930
-
F28 - HEAT EXCHANGE IN GENERAL
-
1634812
-
Patent number 1,634,812
-
Issue date Jul 5, 1927
-
F28 - HEAT EXCHANGE IN GENERAL
-
1608204
-
Patent number 1,608,204
-
Issue date Nov 23, 1926
-
F28 - HEAT EXCHANGE IN GENERAL
-
1537016
-
Patent number 1,537,016
-
Issue date May 5, 1925
-
F28 - HEAT EXCHANGE IN GENERAL
-
1187501
-
Patent number 1,187,501
-
Issue date Jun 20, 1916
-
F24 - HEATING RANGES VENTILATING
-
996733
-
Patent number 996,733
-
Issue date Jul 4, 1911
-
F24 - HEATING RANGES VENTILATING
-
941756
-
Patent number 941,756
-
Issue date Nov 30, 1909
-
F28 - HEAT EXCHANGE IN GENERAL
-
763591
-
Patent number 763,591
-
Issue date Jun 28, 1904
-
F24 - HEATING RANGES VENTILATING
-
475795
-
Patent number 475,795
-
Issue date May 31, 1892
-
F28 - HEAT EXCHANGE IN GENERAL
-
224055
-
Patent number 224,055
-
Issue date Feb 3, 1880
-
F24 - HEATING RANGES VENTILATING
-
171865
-
Patent number 171,865
-
Issue date Jan 4, 1876
-
F24 - HEATING RANGES VENTILATING
-
145961
-
Patent number 145,961
-
Issue date Dec 30, 1873
-
F24 - HEATING RANGES VENTILATING
-
119609
-
Patent number 119,609
-
Issue date Oct 3, 1871
-
F24 - HEATING RANGES VENTILATING
-
95551
-
Patent number 95,551
-
Issue date Oct 5, 1869
-
F24 - HEATING RANGES VENTILATING
-
85554
-
Patent number 85,554
-
Issue date Jan 5, 1869
-
F24 - HEATING RANGES VENTILATING
-
67779
-
Patent number 67,779
-
Issue date Aug 13, 1867
-
F24 - HEATING RANGES VENTILATING
-
65345
-
Patent number 65,345
-
Issue date Jun 4, 1867
-
F24 - HEATING RANGES VENTILATING
-
53770
-
Patent number 53,770
-
Issue date Apr 10, 1866
-
F28 - HEAT EXCHANGE IN GENERAL
-
38210
-
Patent number 38,210
-
Issue date Apr 21, 1863
-
F24 - HEATING RANGES VENTILATING
-
4918
-
Patent number 4,918
-
Issue date Jan 1, 1847
-
B60 - VEHICLES IN GENERAL