# Relationship history for MSHA mine 4400986

Current hierarchy: **Koch Industries Inc → Fincastle Mining Inc → Preparation 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Dilston Mining Corp → Preparation Plant; 1950-01-01 to 1976-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Arthur M Jr → Preparation Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Arthur M Jr → Dilston Mining Corp; 1950-01-01 to 1976-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Gulf + Western Industries Inc & Raven Smokeless Co → Preparation Plant; 1976-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Raven Anchor Smokeless Coal Company → Preparation Plant; 1976-09-21 to 1979-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Gulf + Western Industries Inc & Raven Smokeless Co → Raven Anchor Smokeless Coal Company; 1976-09-21 to 1979-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Fincastle Mining Inc → Preparation Plant; 1979-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Koch Industries Inc → Preparation Plant; 1979-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koch Industries Inc → Fincastle Mining Inc; 1979-05-10 to current/open; source msha-controller-operator-history