# Relationship history for MSHA mine 3101990

Current hierarchy: **Ronnie G  Kirkpatrick Jr → G S Materials Inc → Lemon Springs**

- 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:** G S Materials Inc → Lemon Springs; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** R G  Kirkpatrick Sr. → Lemon Springs; 1986-01-01 to 2018-09-16; source msha-controller-operator-history
- **controller_controls_operator:** R G  Kirkpatrick Sr. → G S Materials Inc; 1986-01-01 to 2018-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Ronnie G  Kirkpatrick Jr → Lemon Springs; 2018-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronnie G  Kirkpatrick Jr → G S Materials Inc; 2018-09-17 to current/open; source msha-controller-operator-history