# Relationship history for MSHA mine 4202758

Current hierarchy: **Terrance  Pecha; Jeffrey  Antczak; Paul  Mumm → Blue Diamond Proppants LLC → Blue Diamond Proppants Utah**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Terrance  Pecha et al → Blue Diamond Proppants Utah; 2022-05-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Proppants LLC → Blue Diamond Proppants Utah; 2024-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terrance  Pecha et al → Blue Diamond Proppants LLC; 2024-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey  Antczak et al → Blue Diamond Proppants LLC; 2024-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Mumm et al → Blue Diamond Proppants LLC; 2024-03-21 to current/open; source msha-controller-operator-history