# Relationship history for MSHA mine 1519335

Current hierarchy: **Bizzack Inc; Steven L  Lawson → Bizzack Construction LLC → Red Rock #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:** Bizzack Inc  et al → Red Rock #4; 2007-05-03 to 2020-01-20; source msha-controller-operator-history
- **operator_operates_mine:** Bizzack Construction LLC → Red Rock #4; 2008-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bizzack Inc  et al → Bizzack Construction LLC; 2008-10-27 to 2020-01-20; source msha-controller-operator-history
- **controller_controls_operator:** Mountain Materials  et al → Bizzack Construction LLC; 2008-10-27 to 2020-01-20; source msha-controller-operator-history
- **controller_controls_mine:** Bizzack Inc et al → Red Rock #4; 2020-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bizzack Inc et al → Bizzack Construction LLC; 2020-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven L  Lawson et al → Bizzack Construction LLC; 2020-01-21 to current/open; source msha-controller-operator-history