# Relationship history for MSHA mine 3607165

Current hierarchy: **Stephen  Perchinski → Three Way Coal Company → 8 Vein 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:** Kurpit Coal Company → 8 Vein Slope; 1981-07-01 to 1983-10-04; source msha-controller-operator-history
- **controller_controls_mine:** Pitcher James J → 8 Vein Slope; 1981-07-01 to 1983-10-04; source msha-controller-operator-history
- **controller_controls_operator:** Pitcher James J → Kurpit Coal Company; 1981-07-01 to 1983-10-04; source msha-controller-operator-history
- **operator_operates_mine:** Three Way Coal Company → 8 Vein Slope; 1983-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  Perchinski → 8 Vein Slope; 1983-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Perchinski → Three Way Coal Company; 1983-10-05 to current/open; source msha-controller-operator-history