# Relationship history for MSHA mine 3503653

Current hierarchy: **James  Beck → L & H Grading Inc → Portable Crushing Plant #2**

- 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:** James  Beck → Portable Crushing Plant #2; 1994-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L & H Grading Inc → Portable Crushing Plant #2; 2006-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Beck → L & H Grading Inc; 2006-09-15 to current/open; source msha-controller-operator-history