# Relationship history for MSHA mine 0301477

Current hierarchy: **Cummins Jim-Marvin Daily → H E Cummins & Sons Construction Company → Site #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:** Thompson Bob → Site #1; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & T Coal Enterprises → Site #1; 1980-04-01 to 1982-02-03; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Bob → B & T Coal Enterprises; 1980-04-01 to 1982-02-03; source msha-controller-operator-history
- **operator_operates_mine:** H E Cummins & Sons Construction Company → Site #1; 1982-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cummins Jim-Marvin Daily Et Al → Site #1; 1982-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cummins Jim-Marvin Daily Et Al → H E Cummins & Sons Construction Company; 1982-02-04 to current/open; source msha-controller-operator-history