# Relationship history for MSHA mine 4604966

Current hierarchy: **Bailey Howard → Little B 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:** Little B Coal Company → No 1 Mine; 1975-12-01 to 1983-05-22; source msha-controller-operator-history
- **controller_controls_mine:** Bailey Henry → No 1 Mine; 1975-12-01 to 1983-05-22; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Henry → Little B Coal Company; 1975-12-01 to 1983-05-22; source msha-controller-operator-history
- **operator_operates_mine:** Little B Coal Company → No 1 Mine; 1983-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bailey Howard → No 1 Mine; 1983-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Howard → Little B Coal Company; 1983-05-23 to current/open; source msha-controller-operator-history