# Relationship history for MSHA mine 1510412

Current hierarchy: **Shell Oil Company → Knott County Coal Company → Knott County Coal Company #1 Tipple**

- 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:** Parma Coals Inc → Knott County Coal Company #1 Tipple; 1977-03-01 to 1983-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Roy R  Crawford et al → Knott County Coal Company #1 Tipple; 1977-03-01 to 1983-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Roy R  Crawford et al → Parma Coals Inc; 1977-03-01 to 1983-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Reading & Bates Corp → Knott County Coal Company #1 Tipple; 1981-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golden Oak Mining Company Inc → Knott County Coal Company #1 Tipple; 1983-09-21 to 1987-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Reading & Bates Corp → Golden Oak Mining Company Inc; 1983-09-21 to 1987-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Knott County Coal Company → Knott County Coal Company #1 Tipple; 1987-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shell Oil Company → Knott County Coal Company #1 Tipple; 1987-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shell Oil Company → Knott County Coal Company; 1987-06-04 to current/open; source msha-controller-operator-history