# Relationship history for MSHA mine 2003210

Current hierarchy: **James  Pieprzak; Terry S  Pieprzak → T R P Sand & Gravel, Inc → T.R.P. 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** T R P Sand & Gravel, Inc → T.R.P. SAND & GRAVEL; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Pieprzak et al → T.R.P. SAND & GRAVEL; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Pieprzak et al → T R P Sand & Gravel, Inc; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry S  Pieprzak et al → T R P Sand & Gravel, Inc; 2001-06-01 to current/open; source msha-controller-operator-history