# Relationship history for MSHA mine 1103102

Current hierarchy: **Michael T  McCullough → Midwest Auger Co. → Cottage Grove 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Michael T  McCullough et al → Cottage Grove Auger; 2002-04-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Midwest Auger Co. → Cottage Grove Auger; 2002-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael T  McCullough et al → Midwest Auger Co.; 2002-04-26 to current/open; source msha-controller-operator-history