# Relationship history for MSHA mine 3605516

Current hierarchy: **Carl Thomas W & Edwin J → C S C Coal Company → Little Comstock**

- 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:** C S C Coal Company → Little Comstock; 1975-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl Thomas W & Edwin J → Little Comstock; 1975-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl Thomas W & Edwin J → C S C Coal Company; 1975-04-21 to current/open; source msha-controller-operator-history