# Relationship history for MSHA mine 3605943

Current hierarchy: **De Leo Frank → Pardeesville Associates → Pardeesville Coal**

- 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:** Tedesco Brothers Coal Company → Pardeesville Coal; 1976-01-01 to 1983-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Tedesco Frank M & Joseph → Pardeesville Coal; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tedesco Frank M & Joseph → Tedesco Brothers Coal Company; 1976-01-01 to 1983-10-05; source msha-controller-operator-history
- **operator_operates_mine:** Kelly Investors Inc → Pardeesville Coal; 1983-10-06 to 1988-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Tedesco Frank L & Larry Et Al → Pardeesville Coal; 1983-10-06 to 1988-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Tedesco Frank L & Larry Et Al → Kelly Investors Inc; 1983-10-06 to 1988-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Pardeesville Associates → Pardeesville Coal; 1988-01-15 to 1991-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Lispi Eugene-Raymond Giza Et Al → Pardeesville Coal; 1988-01-15 to 1991-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Lispi Eugene-Raymond Giza Et Al → Pardeesville Associates; 1988-01-15 to 1991-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Pardeesville Associates → Pardeesville Coal; 1991-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** De Leo Frank → Pardeesville Coal; 1991-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** De Leo Frank → Pardeesville Associates; 1991-02-01 to current/open; source msha-controller-operator-history