# Relationship history for MSHA mine 4604701

Current hierarchy: **Burner Robert & Michael T Marshall → North River Mining Corp → No 11-A Mine**

- 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:** Vago Mining Company Inc → No 11-A Mine; 1975-01-01 to 1975-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Hawkinson M G → No 11-A Mine; 1975-01-01 to 1975-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Hawkinson M G → Vago Mining Company Inc; 1975-01-01 to 1975-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Burner Robert & Michael T Marshall → No 11-A Mine; 1975-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North River Mining Corp → No 11-A Mine; 1975-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burner Robert & Michael T Marshall → North River Mining Corp; 1975-08-15 to current/open; source msha-controller-operator-history