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1960's Plant Patent Counts
year
first
count
1960
PP1,893
116
1961
PP2,009
108
1962
PP2,117
91
1963
PP2,208
129
1964
PP2,337
128
1965
PP2,465
120
1966
PP2,585
114
1967
PP2,699
85
1968
PP2,784
72
1969
PP2,856
103
Total:
1,066
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