# Relationship history for MSHA mine 2102838

Current hierarchy: **Carrol P  Kelley; William F  Quick → Shamrock Enterprises LLC → Crusher 22-70**

- 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

- **controller_controls_mine:** William F  Quick Et Al → Crusher 22-70; 1981-04-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Enterprises LLC → Crusher 22-70; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William F  Quick Et Al → Shamrock Enterprises LLC; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carrol P  Kelley Et Al → Shamrock Enterprises LLC; 1981-06-01 to current/open; source msha-controller-operator-history