# Relationship history for MSHA mine 3603429

Current hierarchy: **Glasgow Inc → Glasgow Inc → SPRING HOUSE 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:** Gill Quarries Inc → SPRING HOUSE QUARRY; 1950-01-01 to 1999-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Harry R  Gill → SPRING HOUSE QUARRY; 1950-01-01 to 2016-05-08; source msha-controller-operator-history
- **controller_controls_operator:** Harry R  Gill → Gill Quarries Inc; 1950-01-01 to 1999-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Glasgow Inc → SPRING HOUSE QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Glasgow Inc → SPRING HOUSE QUARRY; 1999-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glasgow Inc → Glasgow Inc; 1999-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ratoskey & Trainor Inc → SPRING HOUSE QUARRY; 2016-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ratoskey & Trainor Inc → Gill Quarries Inc; 2016-05-09 to 1999-12-09; source msha-controller-operator-history