# Relationship history for MSHA mine 1400157

Current hierarchy: **Mauck Donald G → Donald G Mauck Excavating → Mauck Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Wilson Construction Inc → Mauck Quarry; 1950-01-01 to 1984-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Wilson William R → Mauck Quarry; 1950-01-01 to 1984-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Wilson William R → Wilson Construction Inc; 1950-01-01 to 1984-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Donald G Mauck Excavating → Mauck Quarry; 1984-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mauck Donald G → Mauck Quarry; 1984-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mauck Donald G → Donald G Mauck Excavating; 1984-12-12 to current/open; source msha-controller-operator-history