# Relationship history for MSHA mine 1511075

Current hierarchy: **Coble David R → Delpha Coal Corp → Delpha**

- 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:** Peyton Harold → Delpha; 1977-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** East Fork Coal Company → Delpha; 1978-03-01 to 1979-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Britt Joseph F-Lawrence E Hawkins & Joseph E Balla → Delpha; 1978-03-01 to 1979-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Britt Joseph F-Lawrence E Hawkins & Joseph E Balla → East Fork Coal Company; 1978-03-01 to 1979-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Paradise Mining Company → Delpha; 1979-06-27 to 1980-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Peyton Harold → Paradise Mining Company; 1979-06-27 to 1980-09-24; source msha-controller-operator-history
- **operator_operates_mine:** Delpha Coal Corp → Delpha; 1980-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coble David R → Delpha; 1980-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coble David R → Delpha Coal Corp; 1980-09-25 to current/open; source msha-controller-operator-history