# Relationship history for MSHA mine 4605783

Current hierarchy: **Butler Claude → B & B Construction → No 1 Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Bexley Mining Inc → No 1 Surface; 1978-05-01 to 1980-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Gibbs Roger → No 1 Surface; 1978-05-01 to 1980-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Gibbs Roger → Bexley Mining Inc; 1978-05-01 to 1980-01-17; source msha-controller-operator-history
- **operator_operates_mine:** B & B Construction → No 1 Surface; 1980-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Butler Claude → No 1 Surface; 1980-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Butler Claude → B & B Construction; 1980-01-18 to current/open; source msha-controller-operator-history