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Which of the following are the advantages of a hydraulic shaper over a mechanically driven shaper?                       

1.   More strokes per minute can be obtained at a given cutting speed

2.   The cutting stoke has a definite stopping point

3.   It is simpler in construction

4. Cutting speed is constant throughout most of the cutting storke

Select the correct answer using the codes given below

(a) 1 and 2                      (b) 1 and 4

(c)2 and 4                       (d) 1,3 and 4

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