# Relationship history for MSHA mine 1504129

Current hierarchy: **Lester H Coal Company → H Lester Coal Co → 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:** Whitt Bud → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big John Coal Co → No 1 Mine; 1950-01-01 to 1972-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Big John Coal Company → No 1 Mine; 1950-01-01 to 1972-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Big John Coal Company → Big John Coal Co; 1950-01-01 to 1972-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Whitt Coal Company → No 1 Mine; 1972-07-01 to 1972-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Whitt Bud → Whitt Coal Company; 1972-07-01 to 1972-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Top Coal Co → No 1 Mine; 1972-09-02 to 1972-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Mountain Top Coal Company → No 1 Mine; 1972-09-02 to 1972-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Mountain Top Coal Company → Mountain Top Coal Co; 1972-09-02 to 1972-11-02; source msha-controller-operator-history
- **operator_operates_mine:** H Lester Coal Co → No 1 Mine; 1972-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lester H Coal Company → No 1 Mine; 1972-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lester H Coal Company → H Lester Coal Co; 1972-11-03 to current/open; source msha-controller-operator-history