# Relationship history for MSHA mine 4103533

Current hierarchy: **Tony L  Jacobs Jr → Jacobs Stone Products Inc → Jacobs Stone Products Inc Mine #2**

- 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:** George Amthor Inc → Jacobs Stone Products Inc Mine #2; 1988-08-01 to 2011-10-27; source msha-controller-operator-history
- **controller_controls_mine:** George  Amthor III → Jacobs Stone Products Inc Mine #2; 1988-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Amthor III → George Amthor Inc; 1988-08-01 to 2011-10-27; source msha-controller-operator-history
- **operator_operates_mine:** M. Amthor Construction LLC → Jacobs Stone Products Inc Mine #2; 2011-10-28 to 2022-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Mark D  Amthor → Jacobs Stone Products Inc Mine #2; 2011-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark D  Amthor → M. Amthor Construction LLC; 2011-10-28 to 2022-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Tony L  Jacobs Jr → Jacobs Stone Products Inc Mine #2; 2013-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jacobs Stone Products Inc → Jacobs Stone Products Inc Mine #2; 2022-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony L  Jacobs Jr → Jacobs Stone Products Inc; 2022-11-07 to current/open; source msha-controller-operator-history