# Relationship history for MSHA mine 1509868

Current hierarchy: **Jones Edgar → R D K Mining Inc → No 1 Mine**

- 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:** R D K Mining Company → No 1 Mine; 1976-08-09 to 1977-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Wallen Harry → No 1 Mine; 1976-08-09 to 1977-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Wallen Harry → R D K Mining Company; 1976-08-09 to 1977-02-13; source msha-controller-operator-history
- **operator_operates_mine:** R D K Mining Inc → No 1 Mine; 1977-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jones Edgar Et Al → No 1 Mine; 1977-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones Edgar Et Al → R D K Mining Inc; 1977-02-14 to current/open; source msha-controller-operator-history