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In Norton type feed gearbox for cutting Whitworth standard threads with a standard TPI Lead screw, power flows from

(a) Spindle to Tumbler gear to Norton cone to Meander drive to Lead screw

(b) Spindle to Norton cone to Tumbler gear to Meander drive to Lead screw

(c) Spindle to Tumbler gear to Meander drive to Norton cone to Lead screw

(d) Spindle to Norton cone to Meander drive to Tumbler gear to Lead screw

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