# Relationship history for MSHA mine 4103014

Current hierarchy: **John R  Thompson → J R Thompson Inc → MARTIN 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

- **controller_controls_mine:** Ricks G G → MARTIN QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John R  Thompson → MARTIN QUARRY; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jagoe-Public Company → MARTIN QUARRY; 1980-05-01 to 1987-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Ricks G G → Jagoe-Public Company; 1980-05-01 to 1987-02-10; source msha-controller-operator-history
- **operator_operates_mine:** J R Thompson Inc → MARTIN QUARRY; 1987-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Thompson → J R Thompson Inc; 1987-02-11 to current/open; source msha-controller-operator-history