# Relationship history for MSHA mine 2003585

Current hierarchy: **Paul  Perlongo; Richard  Perlongo → M-52 Sand and Gravel → M-52 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** M-52 Sand and Gravel → M-52 Sand & Gravel; 2019-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Perlongo et al → M-52 Sand & Gravel; 2019-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Perlongo et al → M-52 Sand and Gravel; 2019-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Perlongo et al → M-52 Sand and Gravel; 2019-09-11 to current/open; source msha-controller-operator-history