# Relationship history for MSHA mine 1510228

Current hierarchy: **Newman Berman & Wendell → Atwood Coal Company → No 1 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:** Childers Brothers Coal Company → No 1 Mine; 1977-02-01 to 1978-09-12; source msha-controller-operator-history
- **controller_controls_mine:** Childers Edgar & Paul Et Al → No 1 Mine; 1977-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Childers Edgar & Paul Et Al → Childers Brothers Coal Company; 1977-02-01 to 1978-09-12; source msha-controller-operator-history
- **operator_operates_mine:** Atwood Coal Company → No 1 Mine; 1978-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Newman Berman & Wendell → No 1 Mine; 1978-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newman Berman & Wendell → Atwood Coal Company; 1978-09-13 to current/open; source msha-controller-operator-history