# Relationship history for MSHA mine 4606459

Current hierarchy: **Adams J R & Wilmer Napier → N & A Dredging Inc → Roach 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:** Greene Kaye C--W A Hunt Et Al → Roach Plant; 1979-01-01 to 1988-05-05; source msha-controller-operator-history
- **operator_operates_mine:** H G D & J Mining Company Inc → Roach Plant; 1981-10-01 to 1988-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Greene Kaye C--W A Hunt Et Al → H G D & J Mining Company Inc; 1981-10-01 to 1988-05-05; source msha-controller-operator-history
- **operator_operates_mine:** N & A Dredging Inc → Roach Plant; 1988-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adams J R & Wilmer Napier → Roach Plant; 1988-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adams J R & Wilmer Napier → N & A Dredging Inc; 1988-05-06 to current/open; source msha-controller-operator-history