# Relationship history for MSHA mine 3606325

Current hierarchy: **Andrew J  Sutika; William J  Thorp → Penn-Grampian Coal Company → Jeffrey Strip #1**

- 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:** Jeffrey B Coal Company Inc → Jeffrey Strip #1; 1977-01-01 to 1986-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Graham Guy A → Jeffrey Strip #1; 1977-01-01 to 1986-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Graham Guy A → Jeffrey B Coal Company Inc; 1977-01-01 to 1986-10-09; source msha-controller-operator-history
- **operator_operates_mine:** Penn-Grampian Coal Company → Jeffrey Strip #1; 1986-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Andrew J  Sutika et al → Jeffrey Strip #1; 1986-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew J  Sutika et al → Penn-Grampian Coal Company; 1986-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J  Thorp et al → Penn-Grampian Coal Company; 1986-10-10 to current/open; source msha-controller-operator-history