# Relationship history for MSHA mine 4100260

Current hierarchy: **Burke Edward F → Texas Architectural Clay Inc → Gallagher Pit**

- 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:** Terra Firma Corp → Gallagher Pit; 1950-01-01 to 1980-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Loveless John & Bob → Gallagher Pit; 1950-01-01 to 1980-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Loveless John & Bob → Terra Firma Corp; 1950-01-01 to 1980-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Dome Tile Company Inc → Gallagher Pit; 1980-04-29 to 1980-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Sonny → Gallagher Pit; 1980-04-29 to 1980-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Sonny → Dome Tile Company Inc; 1980-04-29 to 1980-08-29; source msha-controller-operator-history
- **operator_operates_mine:** Texas Architectural Clay Inc → Gallagher Pit; 1980-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burke Edward F → Gallagher Pit; 1980-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burke Edward F → Texas Architectural Clay Inc; 1980-08-30 to current/open; source msha-controller-operator-history