# Relationship history for MSHA mine 2100608

Current hierarchy: **CRH PLC → Hardrives Inc → Rosemount 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

- **operator_operates_mine:** Shakopee Sand & Gravel Company → Rosemount Pit; 1950-01-01 to 1981-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Roberts Harold → Rosemount Pit; 1950-01-01 to 1982-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Harold → Shakopee Sand & Gravel Company; 1950-01-01 to 1981-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Hall → Rosemount Pit; 1950-01-01 to 2017-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Hardrives Inc → Rosemount Pit; 1981-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Hall → Hardrives Inc; 1981-08-17 to 2017-02-23; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Rosemount Pit; 2017-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hardrives Inc; 2017-02-24 to current/open; source msha-controller-operator-history