# Relationship history for MSHA mine 4202425

Current hierarchy: **Richard K Whitaker; Mike  Whitaker → Whitaker Construction → Plymouth**

- 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

- **operator_operates_mine:** Nish Rock → Plymouth; 2005-11-24 to 2016-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Ryan R  Nish  et al → Plymouth; 2005-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan R  Nish  et al → Nish Rock; 2005-11-24 to 2016-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Richard K  Whitaker et al → Nish Rock; 2005-11-24 to 2016-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Hyrum R  Nish et al → Nish Rock; 2005-11-24 to 2016-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Mike  Whitaker et al → Plymouth; 2009-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Whitaker Construction → Plymouth; 2016-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Whitaker et al → Whitaker Construction; 2016-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard K Whitaker et al → Whitaker Construction; 2016-04-04 to current/open; source msha-controller-operator-history