# Relationship history for MSHA mine 0600224

Current hierarchy: **CRH PLC → Tilcon Connecticut Inc. → Tilcon Manchester Quarry**

- 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:** Balf Company → Tilcon Manchester Quarry; 1950-01-01 to 1994-10-18; source msha-controller-operator-history
- **controller_controls_mine:** H C  Savin → Tilcon Manchester Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H C  Savin → Balf Company; 1950-01-01 to 1994-10-18; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Tilcon Manchester Quarry; 1994-10-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Balf Company → Tilcon Manchester Quarry; 1994-10-19 to 2005-08-31; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Balf Company; 1994-10-19 to 2005-08-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Tilcon Manchester Quarry; 1996-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon Connecticut Inc. → Tilcon Manchester Quarry; 2005-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Tilcon Connecticut Inc.; 2005-09-01 to current/open; source msha-controller-operator-history