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GB109086A
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Improvements in and relating to Automatic Musical Instruments.
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US933366A
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Double-scale pneumatic musical instrument.
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US902480A
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Tracker-bar-operating mechanism.
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US902495A
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Tracker-bar and music-sheet mechanism.
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US902479A
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Tracker mechanism.
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US902482A
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Double tracker mechanism.
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GB190717358A
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Improvements in and relating to Automatic Musical Instruments
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US852422A
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Spring-catch.
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US880508A
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Tube-joint for metal tracker-bars and method of forming the same.
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US796112A
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Key-locking device for pneumatic pianos.
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US1160193A
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Tracker and guide apparatus for traveling webs.
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