# Relationship history for MSHA mine 0401009

Current hierarchy: **Aiken Russell A → Volco Research → AIKEN CINDER MINE**

- 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:** Wmk Builders Products → AIKEN CINDER MINE; 1950-01-01 to 1980-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Taggart Construction Company → AIKEN CINDER MINE; 1950-01-01 to 1980-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Taggart Construction Company → Wmk Builders Products; 1950-01-01 to 1980-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Wmk Builders Products → AIKEN CINDER MINE; 1980-03-01 to 1983-11-20; source msha-controller-operator-history
- **controller_controls_mine:** Consolidated Gold Fields Limited → AIKEN CINDER MINE; 1980-03-01 to 1983-11-20; source msha-controller-operator-history
- **controller_controls_operator:** Consolidated Gold Fields Limited → Wmk Builders Products; 1980-03-01 to 1983-11-20; source msha-controller-operator-history
- **operator_operates_mine:** Volco Research → AIKEN CINDER MINE; 1983-11-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aiken Russell A Et Al → AIKEN CINDER MINE; 1983-11-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aiken Russell A Et Al → Volco Research; 1983-11-21 to current/open; source msha-controller-operator-history