# Relationship history for MSHA mine 0100676

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Aggregates → MT. MEIGS S&G**

- 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 → MT. MEIGS S&G; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dravo Corp → MT. MEIGS S&G; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & S Materials Inc → MT. MEIGS S&G; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Maddox Ken R → MT. MEIGS S&G; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maddox Ken R → R & S Materials Inc; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **operator_operates_mine:** J M Jordan Mining Company → MT. MEIGS S&G; 1979-10-01 to 1985-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Jordan James M → MT. MEIGS S&G; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jordan James M → J M Jordan Mining Company; 1979-10-01 to 1985-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Alfred Mc Alpine Inc → MT. MEIGS S&G; 1985-02-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & S Materials Inc → MT. MEIGS S&G; 1985-09-01 to 1990-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Alfred Mc Alpine Inc → R & S Materials Inc; 1985-09-01 to 1990-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Dravo Basic Materials Company Inc → MT. MEIGS S&G; 1990-04-07 to 1995-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Dravo Corp → Dravo Basic Materials Company Inc; 1990-04-07 to 1995-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → MT. MEIGS S&G; 1995-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1995-01-03 to current/open; source msha-controller-operator-history