# Relationship history for MSHA mine 0201092

Current hierarchy: **E Kay  Perkins → Perkins Cinders Inc → Owens Pit**

- 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:** First Knoll Cinder Company → Owens Pit; 1950-01-01 to 1983-11-21; source msha-controller-operator-history
- **controller_controls_mine:** Grant  Brewer et al → Owens Pit; 1950-01-01 to 1983-11-21; source msha-controller-operator-history
- **controller_controls_operator:** Grant  Brewer et al → First Knoll Cinder Company; 1950-01-01 to 1983-11-21; source msha-controller-operator-history
- **operator_operates_mine:** Perkins Cinders Inc → Owens Pit; 1983-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** E Kay  Perkins → Owens Pit; 1983-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E Kay  Perkins → Perkins Cinders Inc; 1983-11-22 to current/open; source msha-controller-operator-history