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an old drawing of a ball bearing machine

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US822723A - Ball-bearing.

Description No. 822,723. P-ATENTED JUNE 5,Y 1906. R. CONRAD. BALL BEARING. APPLICATION FILED PEB.23.1904. 2 SHEETS-SHEET l #mm WML No. 822,723. PATRNTRD JUNR 5, 1906. R. CONRAD. BALL BEARING. APPLICATION EILED FEB. 23. 1904. 2 SHEETS-SHEET 2. WHA/3.95@ fied construction. sTATns FFiOE. BALL-BEARING.. Specicaton of Letters Patent. Application led February 23, 1904. Serial No. 194,894. Patented June 5, 1906. To all whom it may concern: Be it known that LROBERT CONRAD, civil engineer, a subject...

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