# Relationship history for MSHA mine 3606191

Current hierarchy: **David C  Klementik → Solar Fuel Company Inc → Quemahoning Coal Processing 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:** Quemahoning Coal Processing Company → Quemahoning Coal Processing Plant; 1976-07-23 to 1976-12-29; source msha-controller-operator-history
- **controller_controls_mine:** Jamison Philip R → Quemahoning Coal Processing Plant; 1976-07-23 to 1976-12-29; source msha-controller-operator-history
- **controller_controls_operator:** Jamison Philip R → Quemahoning Coal Processing Company; 1976-07-23 to 1976-12-29; source msha-controller-operator-history
- **controller_controls_mine:** Gulf + Western Industries Inc → Quemahoning Coal Processing Plant; 1976-12-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Solar Fuel Company-A Gulf + Western Company → Quemahoning Coal Processing Plant; 1976-12-30 to 1986-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Gulf + Western Industries Inc → Solar Fuel Company-A Gulf + Western Company; 1976-12-30 to 1986-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Solar Fuel Company Inc → Quemahoning Coal Processing Plant; 1986-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David C  Klementik  et al → Quemahoning Coal Processing Plant; 1986-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David C  Klementik  et al → Solar Fuel Company Inc; 1986-03-14 to current/open; source msha-controller-operator-history