# Relationship history for MSHA mine 3602888

Current hierarchy: **Di Pippo Leonard → Valley Forge Coal Corp → Ranshaw Plant**

- 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:** Ranshaw Transportation & Auto Wreckers Company → Ranshaw Plant; 1950-01-01 to 1977-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Walter  Folger et al → Ranshaw Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter  Folger et al → Ranshaw Transportation & Auto Wreckers Company; 1950-01-01 to 1977-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Chapleski et al → Ranshaw Transportation & Auto Wreckers Company; 1950-01-01 to 1977-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Churchill Coal Corp → Ranshaw Plant; 1977-12-14 to 1980-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Gordon → Ranshaw Plant; 1977-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Gordon → Churchill Coal Corp; 1977-12-14 to 1980-03-25; source msha-controller-operator-history
- **operator_operates_mine:** American Coal & Energy Inc → Ranshaw Plant; 1980-03-26 to 1980-10-19; source msha-controller-operator-history
- **controller_controls_mine:** Duran Bob → Ranshaw Plant; 1980-03-26 to 1980-10-19; source msha-controller-operator-history
- **controller_controls_operator:** Duran Bob → American Coal & Energy Inc; 1980-03-26 to 1980-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Valley Forge Coal Corp → Ranshaw Plant; 1980-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Di Pippo Leonard → Ranshaw Plant; 1980-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Di Pippo Leonard → Valley Forge Coal Corp; 1980-10-20 to current/open; source msha-controller-operator-history