# Relationship history for MSHA mine 2301447

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Reform 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 → Reform Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mertens Construction Company Inc → Reform Quarry; 1950-01-01 to 2018-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Mertens Construction Company Inc → Reform Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mertens Construction Company Inc → Mertens Construction Company Inc; 1950-01-01 to 2018-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Con-Agg Llc → Reform Quarry; 2001-12-28 to 2010-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Reform Quarry; 2010-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Con-Agg Companies,LLC → Reform Quarry; 2018-01-26 to 2026-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Con-Agg Llc → Con-Agg Companies,LLC; 2018-01-26 to 2010-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Con-Agg Companies,LLC; 2018-01-26 to 2026-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Reform 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