# Relationship history for MSHA mine 0300040

Current hierarchy: **CRH PLC → APAC-Central, Inc. → Valley Springs 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

- **controller_controls_mine:** Ashland Inc → Valley Springs Quarry; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Mc Clinton Inc → Valley Springs Quarry; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Perry D  Holder → Valley Springs Quarry; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Perry D  Holder → Mc Clinton Inc; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** APAC-Central, Inc. → Valley Springs Quarry; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC-Central, Inc.; 1987-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Valley Springs Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC-Central, Inc.; 2006-08-28 to current/open; source msha-controller-operator-history