# Relationship history for MSHA mine 3607797

Current hierarchy: **City Trust Of Philadelphia → Girardville Coal Company → Packer V**

- 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:** Michael R  Burns → Packer V; 1980-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Burring Coal Inc → Packer V; 1986-04-01 to 1987-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Blaschak Holding Corp → Packer V; 1986-04-01 to 1987-03-02; source msha-controller-operator-history
- **controller_controls_operator:** Blaschak Holding Corp → Burring Coal Inc; 1986-04-01 to 1987-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Burns Coal Company → Packer V; 1987-03-03 to 1996-08-15; source msha-controller-operator-history
- **controller_controls_operator:** Michael R  Burns → Burns Coal Company; 1987-03-03 to 1996-08-15; source msha-controller-operator-history
- **controller_controls_mine:** City Trust Of Philadelphia → Packer V; 1996-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Girardville Coal Company → Packer V; 1996-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** City Trust Of Philadelphia → Girardville Coal Company; 1996-08-16 to current/open; source msha-controller-operator-history