# Relationship history for MSHA mine 4405607

Current hierarchy: **Koch Industries Inc → Reiss Viking Division → Tazewell**

- 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:** Reiss Viking Division → Tazewell; 1981-03-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** C Reiss Coal Company → Tazewell; 1981-03-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_operator:** C Reiss Coal Company → Reiss Viking Division; 1981-03-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Reiss Viking Division → Tazewell; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Koch Industries Inc → Tazewell; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koch Industries Inc → Reiss Viking Division; 1987-01-01 to current/open; source msha-controller-operator-history