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- THE JAMES LEFFEL COMPANY, CIRCA 1944.
- PREFACE.
- PAGE 34. VINTAGE HYDRO TURBINE HISORY PROJECT.
- JAMES LEFFEL LETTERHEAD, CIRCA 1944.
- JAMES LEFFEL & COMPANY'S DOUBLE TURBINE WATER WHEEL CATALOGUE, CIRCA 1868.
- JAMES LEFFEL & COMPANY'S DOUBLE TURBINE WATER WHEEL CATALOGUE, CIRCA 1868.
- JAMES LEFFEL & COMPANY'S DOUBLE TURBINE WATER WHEEL CATALOGUE, CIRCA 1868.
- JAMES LEFFEL & COMPANY'S DOUBLE TURBINE WATER WHEEL CATALOGUE, CIRCA 1868.
- HISTORICAL STATEMENT.
- From Brad's vintage machine shop manufacturing advertisement collection.
- chi.82813478-seq 90
- Bradford Electric's vintage manufacturing history project for 2020.
- Bradford Electric's vintage manufacturing history project for 2020.
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