# Relationship history for MSHA mine 4605326

Current hierarchy: **Chapman Henry → California Fuel Company → No 1**

- 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

- **controller_controls_mine:** Chapman Henry → No 1; 1974-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** California Fuel Company → No 1; 1976-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chapman Henry → California Fuel Company; 1976-10-18 to current/open; source msha-controller-operator-history