# Relationship history for MSHA mine 4605945

Current hierarchy: **Adams J R & Wilmer Napier → A & N Dredging Inc → No 1 Dredge**

- 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:** H G D & J Mining Company Inc → No 1 Dredge; 1979-01-01 to 1986-08-06; source msha-controller-operator-history
- **controller_controls_mine:** Greene Kaye C--W A Hunt Et Al → No 1 Dredge; 1979-01-01 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; 1979-01-01 to 1986-08-06; source msha-controller-operator-history
- **operator_operates_mine:** Adams Sand Gravel Coal → No 1 Dredge; 1986-08-07 to 1988-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Adams J R → No 1 Dredge; 1986-08-07 to 1988-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Adams J R → Adams Sand Gravel Coal; 1986-08-07 to 1988-05-05; source msha-controller-operator-history
- **operator_operates_mine:** A & N Dredging Inc → No 1 Dredge; 1988-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adams J R & Wilmer Napier → No 1 Dredge; 1988-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adams J R & Wilmer Napier → A & N Dredging Inc; 1988-05-06 to current/open; source msha-controller-operator-history