# Relationship history for MSHA mine 1901067

Current hierarchy: **Thomas W  Di Placido → Thomas W Di Placido Corp → THOMAS W. DIPLACIDO CORP.**

- 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:** Thomas W Di Placido Corp → THOMAS W. DIPLACIDO CORP.; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas W  Di Placido → THOMAS W. DIPLACIDO CORP.; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas W  Di Placido → Thomas W Di Placido Corp; 1999-04-01 to current/open; source msha-controller-operator-history