# Relationship history for MSHA mine 2103576

Current hierarchy: **Gary E  Fehn → Dennis Fehn Gravel & Excavating, Inc. → Mahler Pit**

- 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

- **controller_controls_mine:** Gary  Fehn et al → Mahler Pit; 1980-06-01 to 2023-10-25; source msha-controller-operator-history
- **operator_operates_mine:** Dennis Fehn Gravel & Excavating, Inc. → Mahler Pit; 2007-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Fehn et al → Dennis Fehn Gravel & Excavating, Inc.; 2007-05-01 to 2023-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Fehn et al → Dennis Fehn Gravel & Excavating, Inc.; 2007-05-01 to 2023-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Gary E  Fehn → Mahler Pit; 2023-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary E  Fehn → Dennis Fehn Gravel & Excavating, Inc.; 2023-10-26 to current/open; source msha-controller-operator-history