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Comprehensive Income or Loss	9 Months Ended
Comprehensive Income or Loss	Sep. 30, 2017
Comprehensive Income or Loss	D. Comprehensive Income or Loss Comprehensive income or loss represents net income or loss, plus defined benefit plans liability adjustment, net of tax effect and foreign currency translation adjustment. The defined benefit plans liability and foreign currency translation adjustments for the interim periods ended September 30, 2017 and September 24, 2016 were not material.