# Relationship history for MSHA mine 3607367

Current hierarchy: **Stephen  Perchinski → Perchinski Coal Company → Perchinski Slope**

- 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:** Gorenty Tunneling Company → Perchinski Slope; 1982-09-01 to 1991-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Earl L  Gorenty Sr et al → Perchinski Slope; 1982-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earl L  Gorenty Sr et al → Gorenty Tunneling Company; 1982-09-01 to 1991-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Earl L  Gorenty Jr et al → Gorenty Tunneling Company; 1982-09-01 to 1991-02-24; source msha-controller-operator-history
- **operator_operates_mine:** Perchinski Coal Company → Perchinski Slope; 1991-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  Perchinski → Perchinski Slope; 1991-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Perchinski → Perchinski Coal Company; 1991-02-25 to current/open; source msha-controller-operator-history