# Relationship history for MSHA mine 3607500

Current hierarchy: **Smith Darvin C--Allen R Kramer → New Way Coal Company → Seven Foot 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Smith Darvin C--Allen R Kramer Et Al → Seven Foot Slope; 1978-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New Way Coal Company → Seven Foot Slope; 1983-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Darvin C--Allen R Kramer Et Al → New Way Coal Company; 1983-10-01 to current/open; source msha-controller-operator-history