US PATENT SUBCLASS 172 / 900
PLANT THINNERS
Current as of: June, 1999
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DEFINITION
Classification:        172/900  
PLANT THINNERS: 
This art collection is intended to collect all plant thinners  which have an earth working function.  
SEE OR SEARCH THIS CLASS, SUBCLASS: 
5+, for plant thinners having plant sensing means which  actuate automatic power control means.  
SEE OR SEARCH CLASS 
47, Plant Husbandry,  
1.43, for plant thinners which do not have an earth working  
function.