# Relationship history for MSHA mine 1901322

Current hierarchy: **Mark  Kline → OJS LANDSCAPE EXCAVATION, INC. → OJS POWERSCREEN**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** OJS Landscape Excavation, Inc. → OJS POWERSCREEN; 2024-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Kline → OJS POWERSCREEN; 2024-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Kline → OJS Landscape Excavation, Inc.; 2024-06-11 to current/open; source msha-controller-operator-history