# Relationship history for MSHA mine 1102936

Current hierarchy: **Kenyon  Dennis → Kenyon Dennis → MILL CREEK SAND AND GRAVEL**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** O G Dennis → MILL CREEK SAND AND GRAVEL; 1993-04-01 to 2005-01-12; source msha-controller-operator-history
- **controller_controls_mine:** O G  Dennis → MILL CREEK SAND AND GRAVEL; 1993-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** O G  Dennis → O G Dennis; 1993-04-01 to 2005-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Kenyon Dennis → MILL CREEK SAND AND GRAVEL; 2005-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenyon  Dennis → MILL CREEK SAND AND GRAVEL; 2005-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenyon  Dennis → Kenyon Dennis; 2005-01-13 to current/open; source msha-controller-operator-history