# Relationship history for MSHA mine 0102928

Current hierarchy: **Ashland Inc → APAC AL INC. - COUCH DIV → Tocwah 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 → Tocwah Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** APAC AL INC. - COUCH DIV → Tocwah Pit; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC AL INC. - COUCH DIV; 1991-10-01 to current/open; source msha-controller-operator-history