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Dictaphone was prominent in multi-channel recorders.

These are extensively used in the emergency services to record emergency telephone calls ( 911, 999, 112 ) and the subsequent radio conversations.

As financial markets were liberated in the early 1980s, these recorders were used in the financial industry to record conversations in dealing rooms.

The recordings were made on reel-to-reel tape, and could be located and replayed by date and time.

In the late 1980s digital recording was offered as an alternative to the reel-to-reel tape, and soon became the medium of choice.