# Relationship history for MSHA mine 3607014

Current hierarchy: **Nancy  Watkins; William  Magnotti → M & S Quarries → Flat Field 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** M & S Quarries → Flat Field Quarry; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Magnotti et al → Flat Field Quarry; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Magnotti et al → M & S Quarries; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nancy  Watkins et al → M & S Quarries; 1980-06-01 to current/open; source msha-controller-operator-history