# Relationship history for MSHA mine 4404175

Current hierarchy: **Ray Ronnie S & Ralph W → Ray Coal Company → 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

- **controller_controls_mine:** Fuller Rual → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little Byrd Coal Company → No 1 Mine; 1975-09-08 to 1976-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Fuller Rual → Little Byrd Coal Company; 1975-09-08 to 1976-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Steele Bill → No 1 Mine; 1976-03-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & S Coal Company → No 1 Mine; 1976-08-05 to 1977-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Steele Bill → C & S Coal Company; 1976-08-05 to 1977-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Ray Coal Company → No 1 Mine; 1977-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ray Ronnie S & Ralph W → No 1 Mine; 1977-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray Ronnie S & Ralph W → Ray Coal Company; 1977-03-25 to current/open; source msha-controller-operator-history