Hammond organ complete : tunes, tones, and techniques for drawbar keyboards : Limina, Dave : Free Download, Borrow, and Streaming : Internet Archive
![File:US2203569A Musical Instrument (1940-03-08 filed, 1940-06-04 published) by Laurens Hammond - Solovox.pdf - Wikimedia Commons File:US2203569A Musical Instrument (1940-03-08 filed, 1940-06-04 published) by Laurens Hammond - Solovox.pdf - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/US2203569A_Musical_Instrument_%281940-03-08_filed%2C_1940-06-04_published%29_by_Laurens_Hammond_-_Solovox.pdf/page1-408px-US2203569A_Musical_Instrument_%281940-03-08_filed%2C_1940-06-04_published%29_by_Laurens_Hammond_-_Solovox.pdf.jpg)
File:US2203569A Musical Instrument (1940-03-08 filed, 1940-06-04 published) by Laurens Hammond - Solovox.pdf - Wikimedia Commons
![File:USD113021S Electrical Musical Instrument (1938-11-25 filed, 1939-01-24 published) by George H.Stephens - Hammond Novachord.pdf - Wikimedia Commons File:USD113021S Electrical Musical Instrument (1938-11-25 filed, 1939-01-24 published) by George H.Stephens - Hammond Novachord.pdf - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/1/19/USD113021S_Electrical_Musical_Instrument_%281938-11-25_filed%2C_1939-01-24_published%29_by_George_H.Stephens_-_Hammond_Novachord.pdf/page1-800px-USD113021S_Electrical_Musical_Instrument_%281938-11-25_filed%2C_1939-01-24_published%29_by_George_H.Stephens_-_Hammond_Novachord.pdf.jpg)