Patents - Notes Keywords
greenleaf 1953/10/10 -> 2658373 - > 
greenleaf 1954/03/30 -> 2673457 - > 
greenleaf 1957/02/05 -> 2780087 - > 
greenleaf 1957/12/03 -> 2814940 - > 
greenleaf 1958/04/15 -> 2830447 - > 
greenleaf 1958/09/23 -> 2852928 - > 
6 Patents Listed