# Relationship history for MSHA mine 1513432

Current hierarchy: **Brown Layton & Bailus → L B & B Corp → No 1 Strip 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:** L B & B Corp → No 1 Strip Mine; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brown Layton & Bailus → No 1 Strip Mine; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Layton & Bailus → L B & B Corp; 1982-03-01 to current/open; source msha-controller-operator-history