# Relationship history for MSHA mine 4405407

Current hierarchy: **Michael L  Cole → C E D Enterprises Inc → C E D ENTERPRISES INC**

- 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-E Minerals Inc → C E D ENTERPRISES INC; 1980-01-01 to 1981-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Asea Brown Boveri Ltd (ABB) → C E D ENTERPRISES INC; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Asea Brown Boveri Ltd (ABB) → C-E Minerals Inc; 1980-01-01 to 1981-03-16; source msha-controller-operator-history
- **operator_operates_mine:** C E D Enterprises Inc → C E D ENTERPRISES INC; 1981-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael L  Cole  et al → C E D ENTERPRISES INC; 1981-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael L  Cole  et al → C E D Enterprises Inc; 1981-03-17 to current/open; source msha-controller-operator-history