# Relationship history for MSHA mine 1001673

Current hierarchy: **CRH PLC → Staker & Parson Companies → Dingle 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Parson Jack B Companies → Dingle Pit; 1979-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Parson Ready Mix Company → Dingle Pit; 1985-05-01 to 1996-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Parson Jack B Companies → Parson Ready Mix Company; 1985-05-01 to 1996-05-02; source msha-controller-operator-history
- **operator_operates_mine:** Jack B Parson Companies → Dingle Pit; 1996-05-03 to 2002-03-26; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Dingle Pit; 1996-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Jack B Parson Companies; 1996-05-03 to 2002-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Staker & Parson Companies → Dingle Pit; 2002-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Dingle Pit; 2002-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Staker & Parson Companies; 2002-05-30 to current/open; source msha-controller-operator-history