# Relationship history for MSHA mine 2800966

Current hierarchy: **Joan E  Keeler → Van Decker Bros Inc → Van Decker Brothers Incorporated**

- 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:** Joan E  Keeler et al → Van Decker Brothers Incorporated; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Van Decker Bros Inc → Van Decker Brothers Incorporated; 1981-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joan E  Keeler et al → Van Decker Bros Inc; 1981-08-01 to current/open; source msha-controller-operator-history