# Relationship history for MSHA mine 4405343

Current hierarchy: **Davis Hassel → D & V Coal Company → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Lester Troy → No 4; 1977-10-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dry Knob Coal Company Inc → No 4; 1979-12-01 to 1981-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Lester Troy → Dry Knob Coal Company Inc; 1979-12-01 to 1981-03-03; source msha-controller-operator-history
- **operator_operates_mine:** D & V Coal Company → No 4; 1981-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davis Hassel Et Al → No 4; 1981-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Hassel Et Al → D & V Coal Company; 1981-03-04 to current/open; source msha-controller-operator-history