# Relationship history for MSHA mine 2003157

Current hierarchy: **Richard  Masta Sr; Richard  Masta Jr → R Masta & Sons Excavating Llc → MASTA SAND & GRAVEL**

- 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:** R Masta & Sons Excavating Llc → MASTA SAND & GRAVEL; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Masta Jr et al → MASTA SAND & GRAVEL; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Masta Jr et al → R Masta & Sons Excavating Llc; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Masta Sr et al → R Masta & Sons Excavating Llc; 2000-05-01 to current/open; source msha-controller-operator-history