When any claim or counterclaim shall be founded upon any written instrument and the same shall be set up at length in the pleading or a copy attached thereto as an exhibit, the execution of such instrument shall be deemed confessed unless the party charged to have executed the same shall specifically deny the execution thereof.
Mo. Rev. Stat. § 509.240
Execution of written instrument deemed confessed, when
Effective: 28 Aug 1943; (L. 1943 p. 353 § 56)
Official source: Missouri Revisor of Statutes. Reproduced from public-domain Missouri statutes; confirm against the official source for the current text. Not legal advice.