# Relationship history for MSHA mine 1515953

Current hierarchy: **Howell Corporation → Lake Coal Company Inc → Ned Branch No 4**

- 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

- **controller_controls_mine:** Howell Corporation → Ned Branch No 4; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Caudill Hubert W → Ned Branch No 4; 1986-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** First Class Coal Company Inc → Ned Branch No 4; 1987-03-01 to 1987-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Caudill Hubert W → First Class Coal Company Inc; 1987-03-01 to 1987-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Lake Coal Company Inc → Ned Branch No 4; 1987-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howell Corporation → Lake Coal Company Inc; 1987-08-04 to current/open; source msha-controller-operator-history