# Relationship history for MSHA mine 4201263

Current hierarchy: **Moeller William D → American Consolidated Mining Company → Yellow Hammer Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Yellowstone Mining Company → Yellow Hammer Mine; 1950-01-01 to 1980-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Yellowstone Mining Company → Yellow Hammer Mine; 1950-01-01 to 1980-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Yellowstone Mining Company → Yellowstone Mining Company; 1950-01-01 to 1980-04-30; source msha-controller-operator-history
- **operator_operates_mine:** P B Holding Inc → Yellow Hammer Mine; 1980-05-01 to 1982-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Fortin Clarence → Yellow Hammer Mine; 1980-05-01 to 1982-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Fortin Clarence → P B Holding Inc; 1980-05-01 to 1982-05-31; source msha-controller-operator-history
- **operator_operates_mine:** American Consolidated Mining Company → Yellow Hammer Mine; 1982-06-01 to 1984-01-22; source msha-controller-operator-history
- **controller_controls_mine:** Moeller William D → Yellow Hammer Mine; 1982-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moeller William D → American Consolidated Mining Company; 1982-06-01 to 1984-01-22; source msha-controller-operator-history
- **operator_operates_mine:** L C S Mining Company Inc → Yellow Hammer Mine; 1984-01-23 to 1984-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Waite Thomas → Yellow Hammer Mine; 1984-01-23 to 1984-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Waite Thomas → L C S Mining Company Inc; 1984-01-23 to 1984-07-31; source msha-controller-operator-history
- **operator_operates_mine:** American Consolidated Mining Company → Yellow Hammer Mine; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moeller William D → American Consolidated Mining Company; 1984-08-01 to current/open; source msha-controller-operator-history