# Relationship history for MSHA mine 4002758

Current hierarchy: **Layne Alfred → Gipson Coal Company → Mine 4-1**

- 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:** Gipson Coal Company → Mine 4-1; 1981-11-01 to 1984-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Gipson Harold G → Mine 4-1; 1981-11-01 to 1984-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Gipson Harold G → Gipson Coal Company; 1981-11-01 to 1984-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Gipson Coal Company → Mine 4-1; 1984-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Layne Alfred → Mine 4-1; 1984-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Layne Alfred → Gipson Coal Company; 1984-03-23 to current/open; source msha-controller-operator-history