In the 1930s, musician and inventor Paul Tutmarc of Seattle, Washington, developed the first electric bass guitar in its modern form, a fretted instrument designed to be played horizontally. The 1935 sales catalog for Tutmarc’s company Audiovox featured his “Model 736 Bass Fiddle”, a solid-bodied electric bass guitar with four strings, a 30 1⁄2-inch (775-millimetre) scale length, and a single pickup. The use of a guitar’s body shape made the instrument easier to hold and transport than existing stringed bass instruments. The addition of frets enabled bassists to play in tune more easily than on fretless acoustic or electric upright basses. Around 100 were made during this period. Audiovox also sold their “Model 236” bass amplifier.