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The 1937 version of the Robb Wave Organ. Image; National Music Centre,© 2016 National Music Centre, Calgary.AB.

Tone Wheel housing of the 1937 version of the Robb Wave Organ. Image; National Music Centre,© 2016 National Music Centre, Calgary.AB.

The 1937 version of the Robb Wave Organ. Image; National Music Centre,© 2016 National Music Centre, Calgary.AB.

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