# Relationship history for MSHA mine 4404057

Current hierarchy: **Brooks William H → L & D Mining Co Inc → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** L & D Mining Co Inc → No 1 Strip; 1975-04-18 to 1976-01-26; source msha-controller-operator-history
- **controller_controls_mine:** Page F Roger → No 1 Strip; 1975-04-18 to 1976-01-26; source msha-controller-operator-history
- **controller_controls_operator:** Page F Roger → L & D Mining Co Inc; 1975-04-18 to 1976-01-26; source msha-controller-operator-history
- **operator_operates_mine:** L & D Mining Co Inc → No 1 Strip; 1976-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brooks William H → No 1 Strip; 1976-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brooks William H → L & D Mining Co Inc; 1976-01-27 to current/open; source msha-controller-operator-history