petroleum technology
type: Concept
broader: fuel technology

fuel technology
type: Concept
narrower: petroleum technology
narrower: gas technology
narrower: coal technology
broader: energy technology
broader: chemical technology

gas technology
type: Concept
broader: fuel technology

coal technology
type: Concept
broader: fuel technology

energy technology
type: Concept
narrower: fuel technology

chemical technology
type: Concept
narrower: fuel technology

concepts
type: Collection
type: ConceptGroup
member: fuel technology