# Relationship history for MSHA mine 1505432

Current hierarchy: **Diamond Shamrock Corp → Falcon Coal Company Inc → Kenmont Prep 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

- **controller_controls_mine:** Falcon Seaboard Inc → Kenmont Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul J  Sturgill → Kenmont Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golden Oak Mining Company Inc → Kenmont Prep Plant; 1973-01-01 to 1977-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Paul J  Sturgill → Golden Oak Mining Company Inc; 1973-01-01 to 1977-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Falcon Coal Company Inc → Kenmont Prep Plant; 1977-08-25 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Falcon Seaboard Inc → Falcon Coal Company Inc; 1977-08-25 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Diamond Shamrock Corp → Kenmont Prep Plant; 1979-01-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Falcon Coal Company Inc → Kenmont Prep Plant; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Diamond Shamrock Corp → Falcon Coal Company Inc; 1979-02-01 to current/open; source msha-controller-operator-history