# Relationship history for MSHA mine 1601362

Current hierarchy: **Maxwell L  Johnson III → Aggregate Industries → Watson Pit**

- 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 → Watson Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Meridian Aggregates Company LP → Watson Pit; 1991-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → Watson Pit; 2000-03-01 to 2001-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Meridian Aggregates Company LP → Meridian Aggregates Company; 2000-03-01 to 2001-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials → Watson Pit; 2001-05-01 to 2011-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials; 2001-05-01 to 2011-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Maxwell L  Johnson III et al → Watson Pit; 2009-08-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries → Watson Pit; 2011-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maxwell L  Johnson III et al → Aggregate Industries; 2011-05-05 to current/open; source msha-controller-operator-history