# Relationship history for MSHA mine 4801909

Current hierarchy: **Stephen A  Fritz → Cowboy Gravel Inc. → Kleeman MR130 Crusher #1**

- 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:** Cowboy Gravel Inc. → Kleeman MR130 Crusher #1; 2026-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen A  Fritz → Kleeman MR130 Crusher #1; 2026-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen A  Fritz → Cowboy Gravel Inc.; 2026-03-19 to current/open; source msha-controller-operator-history