Assertion: turbine | /r/HasProperty | expensive to make
Facets:
value: historically
type: TEMPORAL
Source sentences:
text: Turbines are expensive to make, requiring precision manufacture and special quality materials.
text: Turbines have historically been more expensive to produce than piston engines, though this is partly because piston engines have been mass-produced in huge quantities for decades, while small gas turbine engines are rarities; however, turbines are mass-produced in the closely related form of the turbocharger.
text: Turbines are expensive to make, requiring precision manufacture and special quality materials.