# Relationship history for MSHA mine 1508784

Current hierarchy: **Brown Earl M & Gersory N Kidd → L & T 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:** Sammons Grover → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mitch Coal Company Inc → No 1 Mine; 1975-09-03 to 1976-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Sammons Grover → Mitch Coal Company Inc; 1975-09-03 to 1976-04-04; source msha-controller-operator-history
- **operator_operates_mine:** L & T Coal Company → No 1 Mine; 1976-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brown Earl M & Gersory N Kidd → No 1 Mine; 1976-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Earl M & Gersory N Kidd → L & T Coal Company; 1976-04-05 to current/open; source msha-controller-operator-history