# Relationship history for MSHA mine 1001637

Current hierarchy: **CRH PLC → City Transfer Redi-Mix → Pearl 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Larry  Sawyer → Pearl Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** City Transfer Redimix Inc → Pearl Pit; 1984-05-01 to 1999-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Sawyer → City Transfer Redimix Inc; 1984-05-01 to 1999-08-25; source msha-controller-operator-history
- **operator_operates_mine:** City Transfer Redi-Mix → Pearl Pit; 1999-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Pearl Pit; 1999-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → City Transfer Redi-Mix; 1999-08-26 to current/open; source msha-controller-operator-history