# Relationship history for MSHA mine 0700059

Current hierarchy: **CRH PLC → Pennsy Supply Inc → Bay Road Plant #7**

- 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

- **operator_operates_mine:** Dover Equipment & Machine Company → Bay Road Plant #7; 1950-01-01 to 1994-05-01; source msha-controller-operator-history
- **controller_controls_mine:** George & Lynch Inc → Bay Road Plant #7; 1950-01-01 to 1994-05-01; source msha-controller-operator-history
- **controller_controls_operator:** George & Lynch Inc → Dover Equipment & Machine Company; 1950-01-01 to 1994-05-01; source msha-controller-operator-history
- **controller_controls_mine:** BTR PLC → Bay Road Plant #7; 1979-04-23 to 1996-09-08; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Bay Road Plant #7; 1993-07-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon Delaware Inc → Bay Road Plant #7; 1994-05-02 to 1996-09-08; source msha-controller-operator-history
- **controller_controls_operator:** BTR PLC → Tilcon Delaware Inc; 1994-05-02 to 1996-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon Delaware → Bay Road Plant #7; 1996-09-09 to 2004-03-29; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Bay Road Plant #7; 1996-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Tilcon Delaware; 1996-09-09 to 2004-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Pennsy Supply Inc → Bay Road Plant #7; 2004-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Pennsy Supply Inc; 2004-03-30 to current/open; source msha-controller-operator-history