# Relationship history for MSHA mine 1700310

Current hierarchy: **CRH PLC → Pike Industries Inc → NORTH WATERFORD PIT & MILL**

- 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:** Cianbro Corp → NORTH WATERFORD PIT & MILL; 1950-01-01 to 1983-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Cianchette Alton → NORTH WATERFORD PIT & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cianchette Alton → Cianbro Corp; 1950-01-01 to 1983-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Milo L  Pike → NORTH WATERFORD PIT & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pike Industries Inc → NORTH WATERFORD PIT & MILL; 1983-06-01 to 1988-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Milo L  Pike → Pike Industries Inc; 1983-06-01 to 1988-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Pike Industries Inc → NORTH WATERFORD PIT & MILL; 1988-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → NORTH WATERFORD PIT & MILL; 1988-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Pike Industries Inc; 1988-06-02 to current/open; source msha-controller-operator-history