# Relationship history for MSHA mine 0100714

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials → Waugh Plant**

- 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 → Waugh Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dravo Corp → Waugh Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alabama Silica Company Inc → Waugh Plant; 1950-01-01 to 1985-02-05; source msha-controller-operator-history
- **controller_controls_mine:** K R  Maddox  et al → Waugh Plant; 1950-01-01 to 1985-02-05; source msha-controller-operator-history
- **controller_controls_operator:** K R  Maddox  et al → Alabama Silica Company Inc; 1950-01-01 to 1985-02-05; source msha-controller-operator-history
- **operator_operates_mine:** R & S Materials Inc → Waugh Plant; 1985-02-06 to 1990-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Alfred Mc Alpine Inc → Waugh Plant; 1985-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alfred Mc Alpine Inc → R & S Materials Inc; 1985-02-06 to 1990-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Dravo Basic Materials Company Inc → Waugh Plant; 1990-01-15 to 1995-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Dravo Corp → Dravo Basic Materials Company Inc; 1990-01-15 to 1995-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Waugh Plant; 1995-01-03 to 2005-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1995-01-03 to 2005-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials → Waugh Plant; 2005-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials; 2005-05-06 to current/open; source msha-controller-operator-history