# Relationship history for MSHA mine 1301422

Current hierarchy: **Greg  Bruening → Skyline Construction Inc/G-71 Sand & Gravel → SKYLINE CONSTRUCTION, INC./G-71**

- 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:** Skyline Construction Inc/G-71 Sand & Gravel → SKYLINE CONSTRUCTION, INC./G-71; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greg  Bruening → SKYLINE CONSTRUCTION, INC./G-71; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Bruening → Skyline Construction Inc/G-71 Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history