John A. Robertson

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Automatic keno game

Amusement devices: games – Chance devices – Electric or magnetic
Patent

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Back draft for exhaust fans and hoods

Fluid handling – Line condition change responsive valves – Direct response valves
Patent

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Ball mill

Solid material comminution or disintegration – Apparatus – With separation or classification of material
Patent

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Belling apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – With means to anchor prime movers support to bore wall
Patent

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Bicycle lock

Locks – Special application – For control and machine elements
Patent

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Profile ID: LFUS-PAI-P-3025

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