# Relationship history for MSHA mine 2302221

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Jeff City 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:** Martin Marietta Materials Inc → Jeff City Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gregory J Muenks et al → Jeff City Quarry; 1990-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Muenks Bros Quarries Inc → Jeff City Quarry; 2000-12-18 to 2008-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Gregory J Muenks et al → Muenks Bros Quarries Inc; 2000-12-18 to 2008-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Con-Agg Llc → Jeff City Quarry; 2001-12-28 to 2010-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Stockman Quarry, LLC → Jeff City Quarry; 2008-08-06 to 2017-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Chad D  Stockman → Jeff City Quarry; 2008-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad D  Stockman → Stockman Quarry, LLC; 2008-08-06 to 2017-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Jeff City Quarry; 2010-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Con-Agg Companies, LLC → Jeff City Quarry; 2017-10-13 to 2026-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Con-Agg Llc → Con-Agg Companies, LLC; 2017-10-13 to 2010-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Con-Agg Companies, LLC; 2017-10-13 to 2026-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Jeff City Quarry; 2026-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2026-03-23 to current/open; source msha-controller-operator-history