# Relationship history for MSHA mine 2402016

Current hierarchy: **Richard J  Ogle → Kenyon Noble Ready Mix → Wash Plant**

- 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 J  Ogle → Wash Plant; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Portable Inc → Wash Plant; 1993-06-01 to 2015-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Richard J  Ogle → Portable Inc; 1993-06-01 to 2015-09-29; source msha-controller-operator-history
- **operator_operates_mine:** Kenyon Noble Ready Mix → Wash Plant; 2015-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard J  Ogle → Wash Plant; 2015-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard J  Ogle → Kenyon Noble Ready Mix; 2015-09-30 to current/open; source msha-controller-operator-history