# Relationship history for MSHA mine 1901015

Current hierarchy: **Christopher  Slade → Crossed Streams Leasing Inc. → Clear Summit**

- 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:** Crossed Streams Leasing Inc. → Clear Summit; 1989-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christopher  Slade → Clear Summit; 1989-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher  Slade → Crossed Streams Leasing Inc.; 1989-03-01 to current/open; source msha-controller-operator-history