# Relationship history for MSHA mine 2103004

Current hierarchy: **Carrol P  Kelley; William F  Quick → Shamrock Enterprises → Screening Plant 22-00**

- 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:** Carrol P  Kelley Et Al → Screening Plant 22-00; 1981-04-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Enterprises → Screening Plant 22-00; 1989-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carrol P  Kelley Et Al → Shamrock Enterprises; 1989-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William F  Quick Et Al → Shamrock Enterprises; 1989-11-01 to current/open; source msha-controller-operator-history