# Relationship history for MSHA mine 4606907

Current hierarchy: **Bowen Max → Bo Mac Ltd → Munson Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Richard G  Preservati II → Munson Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Preservati Construction Company Inc → Munson Strip; 1985-04-01 to 1989-12-04; source msha-controller-operator-history
- **controller_controls_operator:** Richard G  Preservati II → Preservati Construction Company Inc; 1985-04-01 to 1989-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Bowen Max → Munson Strip; 1986-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bo Mac Ltd → Munson Strip; 1989-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bowen Max → Bo Mac Ltd; 1989-12-05 to current/open; source msha-controller-operator-history