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National Trwist Drill

National Trwist Drill.jpg Patent number 2,931,177. Page 4.ThumbnailsRockford, Illinois manufacturing history.Patent number 2,931,177. Page 4.ThumbnailsRockford, Illinois manufacturing history.Patent number 2,931,177. Page 4.ThumbnailsRockford, Illinois manufacturing history.Patent number 2,931,177. Page 4.ThumbnailsRockford, Illinois manufacturing history.