Financial ratios are relationships determined from a company's financial information and used for comparison purposes. Examples include such often referred to measures as return on investment (ROI), return on assets (ROA), and debt-to-equity, to name just three.
Tremolo harmonica. Tremolo harmonicas are a type of harmonica, distinct by having two reeds per note. In a tremolo harmonica the two reeds are tuned slightly off a reference pitch, one slightly sharp and the other slightly flat. This gives a unique wavering or warbling sound created by the two reeds being not exactly in tune with each other and difference in their subsequent waveforms acting against one another.
In the 1920s, Hohner began manufacturing chromatic harmonicas that can be played in any key. Famous harmonicist Borrah Minevitch claimed he sold his design for the chromatic harmonica to Hohner. In the mid-1950s Hohner began producing electric guitars.