# Relationship history for MSHA mine 1700681

Current hierarchy: **CRH PLC → Pike Industries Inc → Manzer 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** CRH PLC → Manzer Pit; 1988-06-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bruce A. Manzer Inc → Manzer Pit; 1999-06-01 to 2018-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Bruce A  Manzer → Manzer Pit; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce A  Manzer → Bruce A. Manzer Inc; 1999-06-01 to 2018-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Pike Industries Inc → Manzer Pit; 2018-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Pike Industries Inc; 2018-02-02 to current/open; source msha-controller-operator-history