# Relationship history for MSHA mine 2902585

Current hierarchy: **Walter  Ratliff → ASAP Oilfield Services LLC → Compton/ crusher model 4043T**

- 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:** ASAP Oilfield Services LLC → Compton/ crusher model 4043T; 2026-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walter  Ratliff → Compton/ crusher model 4043T; 2026-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter  Ratliff → ASAP Oilfield Services LLC; 2026-09-16 to current/open; source msha-controller-operator-history