# Relationship history for MSHA mine 2200493

Current hierarchy: **CRH PLC → APAC, MS Inc. → VOSSBURG 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:** Ashland Inc → VOSSBURG PIT; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Johnston's Sand & Gravel Incorporated → VOSSBURG PIT; 1979-01-01 to 2014-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Donna L  Byrd et al → VOSSBURG PIT; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donna L  Byrd et al → Johnston's Sand & Gravel Incorporated; 1979-01-01 to 2014-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Paula  Johnston et al → Johnston's Sand & Gravel Incorporated; 1979-01-01 to 2014-09-30; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → VOSSBURG PIT; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** APAC, MS Inc. → VOSSBURG PIT; 2014-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC, MS Inc.; 2014-10-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC, MS Inc.; 2014-10-01 to current/open; source msha-controller-operator-history