# Relationship history for MSHA mine 0103185

Current hierarchy: **U S Rock LLC; Iafrate Rock LLC → U S Crushed Stone → U.S. CRUSHED STONE**

- 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:** U S Crushed Stone → U.S. CRUSHED STONE; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** U S Rock LLC et al → U.S. CRUSHED STONE; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Rock LLC et al → U S Crushed Stone; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Iafrate Rock LLC et al → U S Crushed Stone; 2000-04-01 to current/open; source msha-controller-operator-history