# Relationship history for MSHA mine 4604504

Current hierarchy: **Perry Harold M → P O K Coal Company Inc → No 9 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

- **controller_controls_mine:** Miller Paul → No 9 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M & C Coal Company → No 9 Mine; 1975-01-17 to 1976-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Miller Paul → M & C Coal Company; 1975-01-17 to 1976-03-03; source msha-controller-operator-history
- **controller_controls_mine:** Charles E H Jr → No 9 Mine; 1976-02-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & K Coal Inc → No 9 Mine; 1976-03-04 to 1979-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Charles E H Jr → B & K Coal Inc; 1976-03-04 to 1979-03-05; source msha-controller-operator-history
- **operator_operates_mine:** P O K Coal Company Inc → No 9 Mine; 1979-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Perry Harold M → No 9 Mine; 1979-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Perry Harold M → P O K Coal Company Inc; 1979-03-06 to current/open; source msha-controller-operator-history