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	1.	Cotsworth's direct calculator containing over 1,000,000 distinct calculations for expediting and ensuring accuracy in multiplication, division, average, percentage, interest, exchange and general calculation by all combinations of numbers from 1 to 1000 ... M. B. Cotsworth by Cotsworth, M. B Material type: Text; Format: print ; Literary form: Not fiction Publication details: London M. B. Cotsworth 1896 Availability: Not available: Mumbai: Lost (1).
	2.	Cotsworth's direct calculator series 0 M. B. Cotsworth by Cotsworth, M. B Material type: Text; Format: print ; Literary form: Not fiction Publication details: London McCorquodale 1903 Availability: Not available: Mumbai: Lost (1).

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