# Relationship history for MSHA mine 1519104

Current hierarchy: **Bizzack Inc; Steven L  Lawson → Bizzack Construction LLC → US 460 Sta. 3 + 90 and left of 4+ 35**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Bizzack Construction LLC → US 460 Sta. 3 + 90 and left of 4+ 35; 2007-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mountain Materials  et al → US 460 Sta. 3 + 90 and left of 4+ 35; 2007-05-03 to 2020-01-20; source msha-controller-operator-history
- **controller_controls_operator:** Mountain Materials  et al → Bizzack Construction LLC; 2007-05-03 to 2020-01-20; source msha-controller-operator-history
- **controller_controls_operator:** Bizzack Inc  et al → Bizzack Construction LLC; 2007-05-03 to 2020-01-20; source msha-controller-operator-history
- **controller_controls_mine:** Bizzack Inc et al → US 460 Sta. 3 + 90 and left of 4+ 35; 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