1900s
| 1904 | Benjamin Holt tests his steam-powered track-type tractor prototype for the first time. |
| 1906 | Benjamin Holt tests his first gasoline-powered track-type tractor prototype. |
| 1909 | The Holts purchase an existing plant in East Peoria, Illinois. |
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Pliny Holt operates the first steam-powered track-type tractor prototype, No. 77, in Stockton, California.
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Benjamin Holt with an early gas track-type tractor.
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This Holt track-type tractor may be the first Caterpillar tractor built in East Peoria, Illinois.