# Relationship history for MSHA mine 3502646

Current hierarchy: **Michael P Main; Craig A Main → Main Rock Products Inc → Main 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

- **operator_operates_mine:** Main Rock Products Inc → Main Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Maurice E  Main → Main Quarry; 1950-01-01 to 2014-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Maurice E  Main → Main Rock Products Inc; 1950-01-01 to 2014-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Craig A Main et al → Main Quarry; 2014-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig A Main et al → Main Rock Products Inc; 2014-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael P Main et al → Main Rock Products Inc; 2014-05-21 to current/open; source msha-controller-operator-history