# Relationship history for MSHA mine 3304511

Current hierarchy: **Tim E Bell → MGQ, Inc. → Millersville 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

- **controller_controls_mine:** Tim E Bell  et al → Millersville Quarry; 1998-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** MGQ Aggregates Incorporated → Millersville Quarry; 2002-09-26 to 2017-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Tim E Bell  et al → Millersville Quarry; 2002-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim E Bell  et al → MGQ Aggregates Incorporated; 2002-09-26 to 2017-05-01; source msha-controller-operator-history
- **operator_operates_mine:** MGQ, Inc. → Millersville Quarry; 2017-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim E Bell  et al → MGQ, Inc.; 2017-05-02 to current/open; source msha-controller-operator-history