# Relationship history for MSHA mine 0102393

Current hierarchy: **Calvert Bert W → Upper Cliff Mining Company Inc → Mine #1**

- 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

- **controller_controls_mine:** Rogers Jimmy N Sr → Mine #1; 1980-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Heavy Equipment → Mine #1; 1981-10-01 to 1984-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Jimmy N Sr → Rogers Heavy Equipment; 1981-10-01 to 1984-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Upper Cliff Mining Company Inc → Mine #1; 1984-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Calvert Bert W → Mine #1; 1984-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calvert Bert W → Upper Cliff Mining Company Inc; 1984-10-09 to current/open; source msha-controller-operator-history