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US Patent: 612,412
Index-head for milling-machines
Carl L. Grohmann - Hartford, CT

USPTO Classifications:
33/570, 409/223, 74/625, 74/813R, 74/816

Tool Categories:
metalworking machines : indexers and dividers
metalworking machines : milling machines


Not known to have been produced

Henry Bissell
Richard F. Dow

Patent Dates:
Applied: Nov. 05, 1897
Granted: Oct. 18, 1898

Patent Pictures:
USPTO pdf tiff
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We could not determine what the inventor, Carl Ludwig Grohmann, was doing in 1897-98 when he applied for and was granted this patent, 608,854, 610,677, 612,239 612,240, 612,332, and 612,466. The first of those patents was assigned to Pratt & Whitney but none of the others were so assigned. In 1900 he was chief draftsman for the Dow Composing Machine Company. A 1903 clutch patent 736,517, was assigned to that firm, which seems to have been in financial difficulty before that patent was issued. Grohmann's 1905 Linotype-machine patent, 786,211, was assigned to the Mergenthaler Linotype Co. The December 1908 Electric Journal had a note, "Mr. Carl L. Grohmann, until recently chief engineer with the National Cash Register Company, has become associated with the engineering staff of the Niles-Bement-Pond Company, at Hartford, Connecticut." By 1912 Grohmann was the head of Pratt & Whitney's drafting department.

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