Top Cities in South Dakota 1989

Rank City Patents Inventors
#1 Sioux Falls, SD 17 15
#2 Rapid City, SD 11 9
#3 Watertown, SD 4 4
#4 Aberdeen, SD 3 2
#5 Pierre, SD 3 2
#6 Dakota Dunes, SD 3 2
#7 Canton, SD 2 2
#8 Huron, SD 2 2
#9 Brookings, SD 2 2
#10 Melton, SD 2 1
#11 Mitchell, SD 2 2
#12 Belle Fourche, SD 1 1
#13 Parkston, SD 1 1
#14 Hartford, SD 1 1
#15 Hamill, SD 1 1
#16 Wessington, SD 1 1
#17 Baltic, SD 1 1
#18 Fort Pierre, SD 1 1
#19 Egan, SD 1 1
#20 Deadwood, SD 1 1
#21 Custer, SD 1 1
#22 Spearfish, SD 1 1
#23 Colton, SD 1 1
#24 Centerville, SD 1 1
#25 Burke, SD 1 1

Top Inventors in South Dakota 1989

Rank Inventor City Company Patents
1 Terry D. Cook Sioux Falls Sencore 2
1 Ralph R. Rogers Dakota Dunes Thurston Manufacturing 2
1 Robert Zimmerman Rapid City Cetus 2
1 Dennis J. Helfritch Rapid City Research-Cottrell 2
1 Richard L. Peterson Aberdeen Hiniker 2
1 Alvin H. Benesh Pierre 2
1 Mark D. Johnson Sioux Falls Master Lock Company 2
#8 Mark Nash Rapid City Novartis Ag 1
#8 Thomas W. Larson Sioux Falls 1
#8 Alvy Cook Rapid City 1
#8 Elaine A. Tschetter Sioux Falls Sullivans 1
#8 Michael B. Schmit Mitchell 1
#8 Marian D. Sullivan Sioux Falls Sullivans 1
#8 Ross Ortman Sioux Falls Sencore 1
#8 Douglas L. Willrett Sioux Falls Rhodia 1
#8 Craig N. Hansen Sioux Falls Hansen Engine 1
#8 Charles Harwood Sioux Falls Raven Industries 1
#8 Wallace W. Weiger Pierre 1
#8 Douglas L. Hawn Piedmont 1
#8 Joseph B. Skorjanec Sioux Falls 3M 1
#8 Jerry L. Halvorson Rapid City 1
#8 Eric R. Hansen Centerville Ash Grove Cement 1
#8 Curtis J. Clemen Sioux Falls IBM 1
#8 Robert T. McTighe Mitchell 1
#8 Roger D. Stewart Sioux Falls 1

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