# Relationship history for MSHA mine 1510616

Current hierarchy: **Newman Berman & Wendell → Atwood Coal Company → No 2 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

- **controller_controls_mine:** Hamby Charles T Et Al → No 2 Mine; 1977-05-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Charles Hamby Mining Company Inc → No 2 Mine; 1977-08-01 to 1978-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Hamby Charles T Et Al → Charles Hamby Mining Company Inc; 1977-08-01 to 1978-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Newman Berman & Wendell → No 2 Mine; 1978-09-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Atwood Coal Company → No 2 Mine; 1978-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newman Berman & Wendell → Atwood Coal Company; 1978-11-17 to current/open; source msha-controller-operator-history