# Relationship history for MSHA mine 0202790

Current hierarchy: **Merle L Amundson; jEANNE m Amundson → M G Quarries → M.G. QUARRIES**

- 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:** M G Quarries → M.G. QUARRIES; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** jEANNE m Amundson et al → M.G. QUARRIES; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** jEANNE m Amundson et al → M G Quarries; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merle L Amundson et al → M G Quarries; 1998-10-01 to current/open; source msha-controller-operator-history