![18 Review: I had money difficulties and had to sell it. | GTX | Electric Guitars | Reviews @ Ultimate-Guitar.Com @ Ultimate-Guitar.Com 18 Review: I had money difficulties and had to sell it. | GTX | Electric Guitars | Reviews @ Ultimate-Guitar.Com @ Ultimate-Guitar.Com](https://www.ultimate-guitar.com/static/article/gear/8/3658_1_ver0.jpg)
18 Review: I had money difficulties and had to sell it. | GTX | Electric Guitars | Reviews @ Ultimate-Guitar.Com @ Ultimate-Guitar.Com
The National GUITAR Museum - The Origins of Ovation. 48 years ago, Charles Kaman and his group of helicopter engineers submitted their plans for a roundback guitar to the US Patent Office.
![1980's Kaman GTX 23 electric guitar w/ floyd style trem Metallic Gray like dinky or rg565 s/h nice | Reverb 1980's Kaman GTX 23 electric guitar w/ floyd style trem Metallic Gray like dinky or rg565 s/h nice | Reverb](https://rvb-img.reverb.com/image/upload/s--vTTOdIq2--/a_exif,c_limit,e_unsharp_mask:80,f_auto,fl_progressive,g_south,h_620,q_90,w_620/v1477187339/gldmih7dls9epsx774bf.jpg)
1980's Kaman GTX 23 electric guitar w/ floyd style trem Metallic Gray like dinky or rg565 s/h nice | Reverb
![Patent Drawing for the 1967 Guitar Construction by C. H. Kaman Wood Print by StockPhotosArt Com - Fine Art America Patent Drawing for the 1967 Guitar Construction by C. H. Kaman Wood Print by StockPhotosArt Com - Fine Art America](https://render.fineartamerica.com/images/rendered/default/wood-print/7/10/break/images/artworkimages/medium/1/2-patent-drawing-for-the-1967-guitar-construction-by-c-h-kaman-jose-elias-sofia-pereira.jpg)
Patent Drawing for the 1967 Guitar Construction by C. H. Kaman Wood Print by StockPhotosArt Com - Fine Art America
![Amazon.com: Guitar Construction Patent Art Old Look Print in a Beveled Black Wood Frame (5" x 7") M13419: Posters & Prints Amazon.com: Guitar Construction Patent Art Old Look Print in a Beveled Black Wood Frame (5" x 7") M13419: Posters & Prints](https://m.media-amazon.com/images/I/71ItAuOqZpL.jpg)