# Relationship history for MSHA mine 4104141

Current hierarchy: **James R  Howell Jr → Hard Rock Crushing → AMARILLO LAND FILL SITE**

- 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 R  Howell Jr et al → AMARILLO LAND FILL SITE; 1999-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hard Rock Crushing → AMARILLO LAND FILL SITE; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Howell Jr et al → Hard Rock Crushing; 2000-02-01 to current/open; source msha-controller-operator-history