"Demirbaş" refers to the a part of fixed assets of a company that are not subject to regular trade activity but required for continuance of business, such as furniture, machinery, tools, etc. Investopedia, which is one of the most reliable resources for this kind of information, states this as Furniture, Fixtures & Equipment:
http://www.investopedia.com/terms/f/ffe.asp
On the other hand, "inventory" will not be a correct translation for "Demirbaş".
Inventory is defined as "raw materials, work-in-process products and finished goods that are considered to be the portion of a business's assets that are ready or will be ready for sale", which is quite different than furniture, fixtures and equipment.
See: http://www.investopedia.com/terms/i/inventory.asp?ad=dirN&qo...