Miami Valley Inventors Historical Database

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Patent Number:

6602

Title:

Calculating Machine

Issue Date:

1849-07-24

Inventor(s):

Patent Number:

8329

Title:

Rule Calculating

Issue Date:

1851-09-02

Inventor(s):

Notes:

Assignor to John R. Stephen

Patent Number:

21921

Title:

Rule Arithmetical

Issue Date:

1858-10-26

Inventor(s):

3640 Colonel Glenn Highway, Dayton, Ohio 45435. Phone: 937.775.2525