# Relationship history for MSHA mine 3604806

Current hierarchy: **Bav Liquidating Corp → Avery Coal Company Inc → Swistock No 5 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:** Swistock & George → Swistock No 5 Strip; 1973-11-20 to 1976-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Swistock Peter → Swistock No 5 Strip; 1973-11-20 to 1976-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Swistock Peter → Swistock & George; 1973-11-20 to 1976-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Avery Coal Company Inc → Swistock No 5 Strip; 1976-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bav Liquidating Corp → Swistock No 5 Strip; 1976-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bav Liquidating Corp → Avery Coal Company Inc; 1976-03-01 to current/open; source msha-controller-operator-history