# Relationship history for MSHA mine 4002321

Current hierarchy: **United Minerals → Cumberland Coal Processors Ltd → Dayton Spur 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Hicks Dewey → Dayton Spur Tipple; 1974-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & H Coal Company Inc → Dayton Spur Tipple; 1977-09-01 to 1978-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Hicks Dewey → D & H Coal Company Inc; 1977-09-01 to 1978-10-31; source msha-controller-operator-history
- **operator_operates_mine:** United Minerals Inc → Dayton Spur Tipple; 1978-11-01 to 1979-04-24; source msha-controller-operator-history
- **controller_controls_mine:** United Foods → Dayton Spur Tipple; 1978-11-01 to 1979-04-24; source msha-controller-operator-history
- **controller_controls_operator:** United Foods → United Minerals Inc; 1978-11-01 to 1979-04-24; source msha-controller-operator-history
- **operator_operates_mine:** United Minerals → Dayton Spur Tipple; 1979-04-25 to 1983-09-08; source msha-controller-operator-history
- **controller_controls_mine:** Mountain Creek Minerals & Tennessee Resources Deve → Dayton Spur Tipple; 1979-04-25 to 1983-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Mountain Creek Minerals & Tennessee Resources Deve → United Minerals; 1979-04-25 to 1983-09-08; source msha-controller-operator-history
- **controller_controls_mine:** United Minerals Et Al → Dayton Spur Tipple; 1983-01-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cumberland Coal Processors Ltd → Dayton Spur Tipple; 1983-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United Minerals Et Al → Cumberland Coal Processors Ltd; 1983-09-09 to current/open; source msha-controller-operator-history