# Relationship history for MSHA mine 4201758

Current hierarchy: **Moeller William D → American Consolidated Mining Company → American Consolidated Mining Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Oak Springs Mining Company → American Consolidated Mining Plant; 1981-09-01 to 1983-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Oak Springs Mining Company → American Consolidated Mining Plant; 1981-09-01 to 1983-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Oak Springs Mining Company → Oak Springs Mining Company; 1981-09-01 to 1983-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Moeller William D → American Consolidated Mining Plant; 1982-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Consolidated Mining Company → American Consolidated Mining Plant; 1983-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moeller William D → American Consolidated Mining Company; 1983-11-08 to current/open; source msha-controller-operator-history