| Skinner | Courtland | barb wire machine | 322489 | Grinnell | 1885 |
| Leffler | Paul | oil cup | 326662 | Grinnell | 1885 |
| Leffler | Paul | double tree | 327180 | Grinnell | 1885 |
| Ramser | Paul | window screen | 328064 | Montezuma | 1885 |
| Davenny | James | buckle | 333930 | Carnforth | 1886 |
| Hedges | Charles | ice cream freezer | 347600 | Grinnell | 1886 |
| Craver | Charles | harvesting machine | 347692 | Grinnell | 1886 |
| Emslie | William | ditching machine | 348624 | Montezuma | 1886 |
| Ramser | Paul | holder for envelopes | 340355 | Montezuma | 1886 |
| Parmele | James | road grading machine | 368779 | Grinnell | 1887 |
| Daly | John | railway switch | 372255 | Grinnell | 1887 |
| Hamlin | Charles | rake attachment for mowers | 364246 | Grinnell | 1887 |
| Morrison | David | glove | 373470 | Grinnell | 1887 |
| Martin | Joseph | draft equalizer | 375082 | Hartwick | 1887 |
| Moore | Fernando | combined scoop and scale | 367429 | Grinnell | 1887 |
| Thompson | John | combined scoop and scale | 367429 | Grinnell | 1887 |
| Henzie | John | neck yoke coupling | 391048 | Deep River | 1888 |
| Payne | William | harvester | 392687 | Grinnell | 1888 |
| Potter | Edward | wire gate | 380591 | Grinnell | 1888 |
| Ramey | Henry | portable pantry | 381641 | Grinnell | 1888 |
| Hoit | Jacob | sled brake | 376197 | Forest Home | 1888 |
| Leffler | Paul | journal box for crank pins | 400231 | Grinnell | 1889 |
| Goodrich | Joseph | tank heater | 414398 | Grinnell | 1889 |
| Rew | Madison | side delivery hay rake | 410608 | Grinnell | 1889 |
| Sanders | Samuel | sled | 418072 | Montezuma | 1889 |
| Pettit | Samuel | horse hay rake | 411607 | Grinnell | 1889 |
| Lottridge | William | horse hay rake | 411607 | Grinnell | 1889 |
| Sanders | Samuel | vehicle top support | 430439 | Montezuma | 1890 |
| Lottridge | William | reaper mechanism | 434048 | Grinnell | 1890 |
| Barker | Arthur | bicycle | 434234 | Grinnell | 1890 |
| Shepherd | George | car coupling | 428640 | Oak Grove | 1890 |
| Rew | Madison | combined hay rake and tedder | 452319 | Grinnell | 1891 |
| Selle | Herman | haystacker | 457134 | Grinnell | 1891 |
| Alderman | Olinthus | glove fastening | 470170 | Grinnell | 1892 |
| Fenns | Charles | corn harvester and feed cutter | 473111 | Grinnell | 1892 |
| Adams | Benjamin | cash recorder | 467711 | Grinnell | 1892 |
| Rew | Madison | hay rake and loader | 502679 | Grinnell | 1893 |
| Sweeny | George | tool for setting hinges | 560869 | Ewart | 1896 |
| Macy | Jason | road grader | 561264 | Searsborough | 1896 |
| Henzie | Jacob | undertaker's folding truck | 577364 | Deep River | 1897 |
| Billings | John | toy gun | 591090 | Grinnell | 1897 |
| Valentine | Nathan | shaft or tongue coupling | 593004 | Montezuma | 1897 |
| Simpson | William | spring bed bottom | 594915 | Grinnell | 1897 |
| Drake | John | antifreezing stock waterer | 574791 | Brooklyn | 1897 |
| Jackson | Harry | ribbon clasp | 29063 | Searsborough | 1898 |
| Gordin | Jefferson | harness slide D | 29730 | Searsborough | 1898 |
| Bowers | Lillie | stove | 610795 | Grinnell | 1898 |
| Bender | Frank | recleaning attachment for clover or timothy recleaners | 627319 | Stilwell | 1899 |
| Cross | Clarence | clothes pounder | 628076 | Grinnell | 1899 |
| Porter | Harry | hat and clothes rack | 631860 | Hartwick | 1899 |
| Macy | Jason | road grader | 631897 | Searsborough | 1899 |
| Macy | Jason | road grader | 618010 | Searsborough | 1899 |
| Martin | Joseph | hay loader shaft | 619201 | Hartwick | 1899 |
| Wylie | Robert | checking or unchecking device | 635367 | Brooklyn | 1899 |
| Brown | Harry | firearm | 624620 | Grinnell | 1899 |
| Graham | Samuel | self setting animal trap | 625256 | Brooklyn | 1899 |
| Lewis | George | diaphragm motor | 652032 | Grinnell | 1900 |
| Whitehead | George | rotary engine | 664201 | Montezuma | 1900 |
| Rice | Milton | car coupling | 642719 | Carnforth | 1900 |
| Clark | Horace | driving gear for bicycles | 653862 | Grinnell | 1900 |
| Whitehead | George | wagon reach coupling | 654773 | Montezuma | 1900 |
| Nelson | Webster | railway splice bar | 648982 | Carnforth | 1900 |
| Child | Clinton | corner piece | 35089 | Grinnell | 1901 |
| Koch | Arthur | pump rod balance | 685617 | Montezuma | 1901 |
| Worthington | Harry | lead pencil initial stamp | 677482 | Grinnell | 1901 |
| Palmer | Charles | swaging apparatus | 672081 | Grinnell | 1901 |
| Palmer | Charles | casting flask | 699006 | Grinnell | 1902 |
| Knight | Frank | transformable trunk | 693973 | Grinnell | 1902 |
| Koch | Arthur | boring and tenoning machine | 710871 | Montezuma | 1902 |
| Laros | Charles | storm apron fastener | 696574 | Grinnell | 1902 |
| Koch | Arthur | punching and shearing machine | 745628 | Montezuma | 1903 |
| Shull | Robert | clothes drier | 734622 | Guernsey | 1903 |
| Henzie | Jacob | loading and unloading device | 735509 | Deep River | 1903 |
| Ricker | Ella | cake beater | 723407 | Grinnell | 1903 |
| Lewis | William | jack | 740878 | Montezuma | 1903 |
| Gould | Wilbur | renovating cream | 761957 | Deep River | 1904 |
| Macauley | Lorenzo | shackle and tail holder for cows | 751088 | Malcom | 1904 |
| Koch | Arthur | power hammer | 751522 | Montezuma | 1904 |
| Anderson | James | inhaler and sprayer | 776372 | Montezuma | 1904 |
| Ricker | Benjamin | apparel binding | 776618 | Grinnell | 1904 |
| Sayyidah | Murad | combination tool for watch repairing | 766067 | Deep River | 1904 |
| Breniman | William | key guard | 804093 | Brooklyn | 1905 |
| Robertson | Cullen | top prop | 794889 | Grinnell | 1905 |
| Douglass | Harry | top prop | 794889 | Grinnell | 1905 |
| Robertson | Cullen | coffee urn | 794949 | Grinnell | 1905 |
| Foster | Charles | ditching machine | 800367 | Guernsey | 1905 |
| Foster | John | ditching machine | 800367 | Guernsey | 1905 |
| Rew | Madison | side delivery hay rake and loader | 811745 | Grinnell | 1906 |
| Selle | Herman | cornmeal bolter | 819177 | Grinnell | 1906 |
| Hathorn | Henry | tool holder for lathes | 822122 | Grinnell | 1906 |
| Bump | Everett | fat cutting machine | 851614 | Grinnell | 1907 |
| Fahrney | Ezra | road grader | 840305 | Deep River | 1907 |
| Siewert | George | washing machine | 869940 | Brooklyn | 1907 |
| Ricker | Benjamin | apparel glove | 873608 | Grinnell | 1907 |
| Stewart | Floyd | legging | 847843 | Grinnell | 1907 |
| Baird | Charles | hay rake and loader | 890209 | Deep River | 1908 |
| Hicks | Elmer | belt holder for engines | 900538 | Montezuma | 1908 |
| Hicks | Clarence | belt holder for engines | 900538 | Montezuma | 1908 |
| Fowler | Joseph | cream separator | 879379 | Grinnell | 1908 |
| Peters | Henry | cream separator | 879379 | Grinnell | 1908 |
| Barnes | Charles | cream separator | 879379 | Grinnell | 1908 |
| Stafford | Thomas | stove grate | 880472 | Brooklyn | 1908 |
| Carter | Hillery | animal trap | 882373 | Brooklyn | 1908 |
| Spracklen | Daniel | weight motor | 935422 | Deep River | 1909 |
| Baird | Charles | hay rack | 927019 | Deep River | 1909 |
| Wells | Elmer | hay rack | 938928 | Grinnell | 1909 |
| Meyers | Paul | electric water heater | 939054 | Grinnell | 1909 |
| Hays | Joseph | clothes stick | 932276 | Chester Township, Poweshiek County | 1909 |
