# Relationship history for MSHA mine 2302014

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Stoner Sand**

- 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 → Stoner Sand; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stoner Sand & Gravel → Stoner Sand; 1990-01-01 to 2004-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Kenny  Stoner → Stoner Sand; 1990-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenny  Stoner → Stoner Sand & Gravel; 1990-01-01 to 2004-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Con-Agg Llc → Stoner Sand; 2001-12-28 to 2010-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Stoner Sand LLC → Stoner Sand; 2005-01-01 to 2018-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Kenny  Stoner → Stoner Sand; 2005-01-01 to 2016-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Kenny  Stoner → Stoner Sand LLC; 2005-01-01 to 2016-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Stoner Sand; 2010-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peggy  Stoner → Stoner Sand; 2016-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peggy  Stoner → Stoner Sand LLC; 2016-06-07 to 2018-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Con-Agg Companies, LLC → Stoner Sand; 2018-02-16 to 2026-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Con-Agg Llc → Con-Agg Companies, LLC; 2018-02-16 to 2010-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Con-Agg Companies, LLC; 2018-02-16 to 2026-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Stoner Sand; 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