Bone loss with missing teeth, partials and complete dentures is progressive. These sinusoids are called harmonics, overtones, or generally, partials. But if there are inharmonic partials, the numbering no longer coincides. However they only produce partials matching the odd harmonics, at least in theory. Antique singing bowls are known for producing multiple harmonic partials or multiphonics. Harmonics are also called "overtones" or "partials". Harmonics may also be called "overtones", "partials" or "upper partials". However, the machine was only able to create exact harmonic partials, sounding sterile and inexpressive. It results in improved intonation and stronger harmonically related partials across the player's range. The alloy is a commonly used as a metal framework for dental partials. This process of ring modulation produces a signal rich in partials. A vibrating string has one fundamental and a series of partials. Additionally, the two notes have many of the same partials. They produce a bright sound that is low in fundamentals and rich in upper partials.