Other attributes
Classification Type
Parent Classification
No article content yet.
Timeline
No Timeline data yet.
Further Resources
No Further Resources data yet.
E21B 4/16
Plural down-hole drives, e.g. for combined percussion and rotary drilling ; Drives for multi-bit drilling units
Find more entities like E21B 4/16
Use the Golden Query Tool to find similar entities by any field in the Knowledge Graph, including industry, location, and more.
