# Relationship history for MSHA mine 3608631

Current hierarchy: **Inter-Power/Ahlcon Partners LP → Fuel Recovery, Inc. → Sonman Refuse Site**

- 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:** Fuel Recovery, Inc. → Sonman Refuse Site; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Inter-Power/Ahlcon Partners LP et al → Sonman Refuse Site; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Inter-Power/Ahlcon Partners LP et al → Fuel Recovery, Inc.; 1997-04-01 to current/open; source msha-controller-operator-history