- 1947 TABULATION GOVERNOR APPLICATION DATA.
- 1947 TABULATION GOVERNOR APPLICATION DATA.
- Bradford Electric's vintage manufacturing history project for 2020.
- Bradford Electric's vintage manufacturing history project for 2020.
- JAMES LEFFEL & COMPANY'S DOUBLE TURBINE WATER WHEEL CATALOGUE, CIRCA 1868.
- JAMES LEFFEL & COMPANY'S DOUBLE TURBINE WATER WHEEL CATALOGUE, CIRCA 1868.
- PREFACE.
- HISTORICAL STATEMENT.
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