# Relationship history for MSHA mine 4202650

Current hierarchy: **Richard K Whitaker; Mike  Whitaker → Whitaker Construction, Co. Inc. → Whitaker - Portable 1**

- 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:** Richard K Whitaker et al → Whitaker - Portable 1; 2009-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Whitaker Construction, Co. Inc. → Whitaker - Portable 1; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard K Whitaker et al → Whitaker Construction, Co. Inc.; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Whitaker et al → Whitaker Construction, Co. Inc.; 2016-01-01 to current/open; source msha-controller-operator-history