# Relationship history for MSHA mine 0504683

Current hierarchy: **James H  Kirkland → Kirkland Construction LLLP → SCREENING PLANT**

- 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:** Kirkland Construction LLLP → SCREENING PLANT; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James H  Kirkland  et al → SCREENING PLANT; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James H  Kirkland  et al → Kirkland Construction LLLP; 2000-04-01 to current/open; source msha-controller-operator-history