# Relationship history for MSHA mine 4405360

Current hierarchy: **Bill G  Humphreys → Staniford Coal Inc → No 1 Prep Plant**

- 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:** Bee Coal Processing Inc → No 1 Prep Plant; 1980-01-01 to 1981-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Bright Tommy N-Carter C Long Et Al → No 1 Prep Plant; 1980-01-01 to 1981-03-15; source msha-controller-operator-history
- **controller_controls_operator:** Bright Tommy N-Carter C Long Et Al → Bee Coal Processing Inc; 1980-01-01 to 1981-03-15; source msha-controller-operator-history
- **operator_operates_mine:** Staniford Coal Inc → No 1 Prep Plant; 1981-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill G  Humphreys → No 1 Prep Plant; 1981-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill G  Humphreys → Staniford Coal Inc; 1981-03-16 to current/open; source msha-controller-operator-history