# Relationship history for MSHA mine 4002255

Current hierarchy: **Crowley James → Central Mining Company Inc → Central Mining No 1 Strip**

- 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:** Central Mining Company Inc → Central Mining No 1 Strip; 1977-06-01 to 1978-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Zimmerman W A → Central Mining No 1 Strip; 1977-06-01 to 1978-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Zimmerman W A → Central Mining Company Inc; 1977-06-01 to 1978-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Central Mining Company Inc → Central Mining No 1 Strip; 1978-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crowley James → Central Mining No 1 Strip; 1978-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crowley James → Central Mining Company Inc; 1978-07-20 to current/open; source msha-controller-operator-history