# Relationship history for MSHA mine 1513635

Current hierarchy: **Wilson Henry → B & M 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:** B & M Coal Company → No 1 Mine; 1982-07-01 to 1982-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Sidney Et Al → No 1 Mine; 1982-07-01 to 1982-10-03; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Sidney Et Al → B & M Coal Company; 1982-07-01 to 1982-10-03; source msha-controller-operator-history
- **operator_operates_mine:** B & M Coal Company → No 1 Mine; 1982-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilson Henry Et Al → No 1 Mine; 1982-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Henry Et Al → B & M Coal Company; 1982-10-04 to current/open; source msha-controller-operator-history