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SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN name ON name.patent = patent.patent AND name.type = patent.type WHERE (category = 'Helical') ORDER BY last_name ASC, first_name, date, patent, type

Total of 3 patents found where: Category is 'Helical';

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T / S Patent Date Description Patentee Category Assigned To
 CRAMER, Walter
U 1,894,292 January 17, 1933 Strain Insulator
Helical strain insulator		 CRAMER, Walter
 Helical Locke Insulator Corp.
 HALTON, Geoffrey H.
U 1,942,284 January 2, 1934 Electric Insulator
Helical grooves on top surface of suspension insulator		 HALTON, Geoffrey H.
 Helical Steatite & Porc. Prod. Ltd.
 TAYLOR, John J.
U 2,155,848 April 25, 1939 Insulator
Helical suspension & helical post type		 TAYLOR, John J.
 Helical The Ohio Brass Co.

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