List of obsolete technology

This is a list of obsolete technology, superseded by newer technologies. Obsolescence is defined as the "transition from available to unavailable from the manufacturer in accordance with the original specification." Newer technologies can mostly be considered as disruptive innovation. Many older technologies co-exist with newer alternatives, or are still in use due to cost, convenience, personal preference or availability. Some people still use their existing CD collections or their old functional equipment. Some prefer the sound of vinyl records. Specialist or niche applications use technology that may have become commercially obsolete, like the vacuum tube. Historical societies may maintain a working knowledge of old machines.

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