# Relationship history for MSHA mine 4607141

Current hierarchy: **Avx Inc → Viking Coal Company Inc → Howesville Tipple**

- 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:** Avx Inc → Howesville Tipple; 1975-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Viking Coal Company Inc → Howesville Tipple; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Avx Inc → Viking Coal Company Inc; 1986-06-01 to current/open; source msha-controller-operator-history