13 January 1942
On 13 January 1942, US Patent No. 2,269,452 was granted to Henry Ford and Eugene Gregorie for “Automobile chassis construction”.
Tag 13 January
Read More13 January 1942
13 January 1931
On 13 January 1931, US Patent No. 1,788,434 was granted to Leonarde Keeler for an “Apparatus for recording arterial blood pressure”.
13 January 1874
On 13 January 1874, Cyrus G. Spalding, a Boston bookkeeper, received US Patent No. 146,407 for an “Improvement in adding-machines”.