# Relationship history for MSHA mine 0100013

Current hierarchy: **William S  Langford → C A Langford Company Inc → C A Langford Co Inc**

- 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:** C A Langford Company Inc → C A Langford Co Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles A  Langford et al → C A Langford Co Inc; 1950-01-01 to 2024-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Charles A  Langford et al → C A Langford Company Inc; 1950-01-01 to 2024-01-31; source msha-controller-operator-history
- **controller_controls_operator:** William S  Langford et al → C A Langford Company Inc; 1950-01-01 to 2024-01-31; source msha-controller-operator-history
- **controller_controls_mine:** William S  Langford → C A Langford Co Inc; 2024-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William S  Langford → C A Langford Company Inc; 2024-02-01 to current/open; source msha-controller-operator-history