# Relationship history for MSHA mine 3608757

Current hierarchy: **Constellation Holdings Inc; Ahlstrom Development Corp → A/C Fuels Company → Audenried Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** A/C Fuels Company → Audenried Mine; 1998-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ahlstrom Development Corp et al → Audenried Mine; 1998-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ahlstrom Development Corp et al → A/C Fuels Company; 1998-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Constellation Holdings Inc et al → A/C Fuels Company; 1998-11-01 to current/open; source msha-controller-operator-history