# Relationship history for MSHA mine 2902105

Current hierarchy: **Roland Cliff → Gardner Enterprise → Roswell Mill**

- 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:** Gardner Enterprise → Roswell Mill; 1993-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roland Cliff → Roswell Mill; 1993-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roland Cliff → Gardner Enterprise; 1993-01-01 to current/open; source msha-controller-operator-history