# Relationship history for MSHA mine 0402664

Current hierarchy: **Peter Kiewit Sons' Inc → Twin Mountain Rock Company → Lavic Stone Quarry**

- 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:** Peter Kiewit Sons' Inc → Lavic Stone Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lavic Stone Corp → Lavic Stone Quarry; 1950-01-01 to 1980-08-15; source msha-controller-operator-history
- **controller_controls_mine:** Project Equities Inc → Lavic Stone Quarry; 1950-01-01 to 1980-08-15; source msha-controller-operator-history
- **controller_controls_operator:** Project Equities Inc → Lavic Stone Corp; 1950-01-01 to 1980-08-15; source msha-controller-operator-history
- **operator_operates_mine:** Twin Mountain Rock Company → Lavic Stone Quarry; 1980-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Twin Mountain Rock Company; 1980-08-16 to current/open; source msha-controller-operator-history