# Relationship history for MSHA mine 2200697

Current hierarchy: **W E Blain & Sons Inc; Blain Inc → Blain Companies → Mt. Olive Crusher**

- 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:** Blain Companies → Mt. Olive Crusher; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blain Inc  et al → Mt. Olive Crusher; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blain Inc  et al → Blain Companies; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W E Blain & Sons Inc  et al → Blain Companies; 1998-06-01 to current/open; source msha-controller-operator-history