# Relationship history for MSHA mine 1800678

Current hierarchy: **Scott V  Watkins; Robert V  Watkins → M & S STONE QUARRIES INC → M & S STONE QUARRIES INC**

- 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:** M & S Stone Quarries Inc → M & S STONE QUARRIES INC; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Magnotti et al → M & S STONE QUARRIES INC; 1980-08-01 to 2012-11-30; source msha-controller-operator-history
- **controller_controls_operator:** William  Magnotti et al → M & S Stone Quarries Inc; 1980-08-01 to 2012-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Nancy  Watkins et al → M & S Stone Quarries Inc; 1980-08-01 to 2012-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Scott V  Watkins et al → M & S STONE QUARRIES INC; 2012-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott V  Watkins et al → M & S Stone Quarries Inc; 2012-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert V  Watkins  et al → M & S Stone Quarries Inc; 2012-12-01 to current/open; source msha-controller-operator-history