# Relationship history for MSHA mine 3602667

Current hierarchy: **Keel Infrastructure Corp → Clearfield Properties Inc → Benjamin #6**

- 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:** Benjamin Coal Company → Benjamin #6; 1950-01-01 to 1993-09-16; source msha-controller-operator-history
- **controller_controls_mine:** David J  Benjamin → Benjamin #6; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David J  Benjamin → Benjamin Coal Company; 1950-01-01 to 1993-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Clearfield Properties Inc → Benjamin #6; 1993-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scrubgrass Generating Company LP → Benjamin #6; 1993-09-17 to 2025-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Scrubgrass Generating Company LP → Clearfield Properties Inc; 1993-09-17 to 2025-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Keel Infrastructure Corp → Benjamin #6; 2025-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keel Infrastructure Corp → Clearfield Properties Inc; 2025-03-27 to current/open; source msha-controller-operator-history