# Relationship history for MSHA mine 0600840

Current hierarchy: **Jeffrey  Strmiska; James  Strmiska → Oneco Gravel LLC → Oneco Gravel LLC**

- 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:** Oneco Gravel LLC → Oneco Gravel LLC; 2023-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey  Strmiska et al → Oneco Gravel LLC; 2023-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey  Strmiska et al → Oneco Gravel LLC; 2023-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Strmiska et al → Oneco Gravel LLC; 2023-10-11 to current/open; source msha-controller-operator-history