# Relationship history for MSHA mine 4608966

Current hierarchy: **David A  Betscher; Bobby J  Adkins → B & A Excavating, Inc. → Mid-Vol Auger**

- 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

- **controller_controls_mine:** David A  Betscher et al → Mid-Vol Auger; 2001-03-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & A Excavating, Inc. → Mid-Vol Auger; 2002-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David A  Betscher et al → B & A Excavating, Inc.; 2002-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby J  Adkins et al → B & A Excavating, Inc.; 2002-07-19 to current/open; source msha-controller-operator-history