# Relationship history for MSHA mine 0600705

Current hierarchy: **Edward  Spazzarini → Powder Hill Sand & Gravel, LLC → Enfield Pit**

- 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:** Mark  Spazzarini → Enfield Pit; 2002-03-01 to 2021-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Powder Hill Sand & Gravel, LLC → Enfield Pit; 2002-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Spazzarini → Powder Hill Sand & Gravel, LLC; 2002-05-21 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Edward  Spazzarini → Enfield Pit; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Spazzarini → Powder Hill Sand & Gravel, LLC; 2022-01-01 to current/open; source msha-controller-operator-history