Junghans luminous compound - Helicopters and Pocket Watches by Dirk E. Fassbender

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Junghans luminous compound

Junghans
Junghans used following luminous compounds on their watches:

Radium 226 from 1907 until 1958
Promethium 147 from 1958 until 1998
Super Luminova, non radioactive from 1998
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