# Relationship history for MSHA mine 1516395

Current hierarchy: **Ashland Inc → Hawkeye Services Corp → #2 Surface**

- 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:** Hawkeye Services Corp → #2 Surface; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → #2 Surface; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Hawkeye Services Corp; 1988-06-01 to current/open; source msha-controller-operator-history