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501. Electrolysis of underground conductors Electrolysis of underground conductors Beck, W. J.; Yount, J. M. 1896

502. Electro-metallurgical furnace and its products Electro-metallurgical furnace and its products May, W. T.; Rodman, T. H. 1896

503. Electro-chemical process for extracting gold and silver from rebellious ores Electro-chemical process for extracting gold and silver from rebellious ores Stabler, L. J. 1898

504. Electro-chemical analysis Electro-chemical analysis McCoy, Herbert N. 1892

505. Electricity as applied to printing press machinery and tests on same Electricity as applied to printing press machinery and tests on same Wynn, J. G. 1900

506. Electrical development of a waterfall Electrical development of a waterfall Jamison, A. P. 1898

507. Electric motors and methods of testing their efficiency Electric motors and methods of testing their efficiency Wilmore, John Jenkins 1888

508. Ehrlich's methylene blue process for staining ultimate nerve-fibrillae Ehrlich's methylene blue process for staining ultimate nerve-fibrillae Myers, Edgar Harris 1903

509. Efficiency tests on the Baldwin compound locomotive Efficiency tests on the Baldwin compound locomotive Cooper, Eugene S.; Meriam, Joseph B. 1897

510. Efficiency tests on direct current enclosed-arc lamps Efficiency tests on direct current enclosed-arc lamps Slimp, Oliver F.; Cromwell, Lewis W. 1900

511. Efficiency tests of the municipal arc-lighting plant of the city of Martinsville, Indiana Efficiency tests of the municipal arc-lighting plant of the city of Martinsville, Indiana Dryden, Harry W.; Axtell, G. W. 1897

512. Efficiency tests of locomotive Schenectady Efficiency tests of locomotive Schenectady Kerr, Edward Wilson 1895

513. Efficiency tests of a New York air pump Efficiency tests of a New York air pump Wiselogel, R. F. 1895

514. Efficiency test upon the Purdue electrical power plant Efficiency test upon the Purdue electrical power plant Clarke, F. A.; Marks, T. R. 1896

515. Efficiency test of the citizens' lighting plant Lafayette Indiana Efficiency test of the citizens' lighting plant Lafayette Indiana Allen, T.S.; Knight, E.R. 1899

516. Efficiency test of muncie electric light plant Efficiency test of muncie electric light plant Haymond, W. O.; Gough, Cale R. 1901

517. Efficiency test of a Westinghouse one horse power single phase induction motor Efficiency test of a Westinghouse one horse power single phase induction motor Browning, Earl Harrison; Gregg, Carl Reed 1897

518. Efficiency test of a transformer from its curves Efficiency test of a transformer from its curves Ratcliff, L. S.; Morawick, H. H. 1896

519. Efficiency test of a 20 H.P. single phase induction motor Efficiency test of a 20 H.P. single phase induction motor Tanner, A. R.; Eaton, Wyman 1901

520. Efficiency test of a 125 horse power gas engine Efficiency test of a 125 horse power gas engine Colburn, George Louis; Johnson, Leland Fox 1898
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