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4.4 Operating income

in CHF thousand   2017   2016
Net revenue from sales to customers        
Sales of goods and products   268,610   278,506
Revenue from services rendered   18,963   19,524
Revenue from license fees   929   847
Total net revenue from sales to customers   288,502   298,877
Other operating income        
Rental income from operating leases   683   663
Gain from sales of non-current assets   207   8
Other income   3,709   4,455
Total operating income   4,599   5,126
Changes in inventories of semi-finished and finished products, capitalised costs        
Changes in inventories of semi-finished and finished products   –2,657   –4,661
Capitalised costs   586   96
Total changes in inventories of semi-finished and finished products, capitalised costs   –2,071   –4,565
Total operating income   291,030   299,438

In the 2017 financial year, the net proceeds from tradable goods and products includes income from production orders calculated using the PoC method in the amount of CHF 117,953,000 (2016: CHF 105,642,000). The changes in inventories of semi-finished and finished products include write-downs amounting to CHF 2,657,000 relating to the Industrial Systems segment. See also note 4.2.