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1950's Plant Patent Counts
year
first
count
1950
PP911
89
1951
PP1,001
58
1952
PP1,059
101
1953
PP1,160
78
1954
PP1,238
101
1955
PP1,339
103
1956
PP1,442
101
1957
PP1,543
129
1958
PP1,672
120
1959
PP1,792
101
Total:
981
1940's
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