# Relationship history for MSHA mine 4000592

Current hierarchy: **Welden Gary R → W & W Coal Company → #1**

- 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:** S & H Coal Company → #1; 1950-01-01 to 1974-06-03; source msha-controller-operator-history
- **controller_controls_mine:** S & H Coal Company → #1; 1950-01-01 to 1974-06-03; source msha-controller-operator-history
- **controller_controls_operator:** S & H Coal Company → S & H Coal Company; 1950-01-01 to 1974-06-03; source msha-controller-operator-history
- **operator_operates_mine:** J & M Coal Company → #1; 1974-06-04 to 1987-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Doris - Zie Muse Et Al → #1; 1974-06-04 to 1987-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Doris - Zie Muse Et Al → J & M Coal Company; 1974-06-04 to 1987-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Jordan Ronnie & Ted → #1; 1976-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jordan Brothers Coal Company Inc → #1; 1987-04-28 to 1987-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Jordan Ronnie & Ted → Jordan Brothers Coal Company Inc; 1987-04-28 to 1987-08-02; source msha-controller-operator-history
- **operator_operates_mine:** A V & L Coal Company Inc → #1; 1987-08-03 to 1990-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Welden Alec C → #1; 1987-08-03 to 1990-10-28; source msha-controller-operator-history
- **controller_controls_operator:** Welden Alec C → A V & L Coal Company Inc; 1987-08-03 to 1990-10-28; source msha-controller-operator-history
- **operator_operates_mine:** W & W Coal Company → #1; 1990-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Welden Gary R → #1; 1990-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Welden Gary R → W & W Coal Company; 1990-10-29 to current/open; source msha-controller-operator-history