# Relationship history for MSHA mine 3608399

Current hierarchy: **Kenneth M  Pollock → Emerald Anthracite II → No 7 Operation**

- 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:** Kenneth M  Pollock et al → No 7 Operation; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** De Leo Frank → No 7 Operation; 1991-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth M  Pollock et al → No 7 Operation; 1993-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pardeesville Associates → No 7 Operation; 1993-03-01 to 1995-01-24; source msha-controller-operator-history
- **controller_controls_operator:** De Leo Frank → Pardeesville Associates; 1993-03-01 to 1995-01-24; source msha-controller-operator-history
- **operator_operates_mine:** Susquehanna Coal Company → No 7 Operation; 1995-01-25 to 2005-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth M  Pollock et al → Susquehanna Coal Company; 1995-01-25 to 2005-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Emerald Anthracite II → No 7 Operation; 2005-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth M  Pollock et al → Emerald Anthracite II; 2005-11-16 to current/open; source msha-controller-operator-history