# Relationship history for MSHA mine 0301617

Current hierarchy: **Davis Barry M → Davis Coal Corp → Hackett Project**

- 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:** Davis Coal Corp → Hackett Project; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davis Barry M → Hackett Project; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Barry M → Davis Coal Corp; 1986-12-01 to current/open; source msha-controller-operator-history