# Relationship history for MSHA mine 2401797

Current hierarchy: **Nancy  Bunn; Roy  Bunn → Nancy & Roy Bunn → N & R BUNN CRUSHER**

- 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:** Herbert Tindall Construction → N & R BUNN CRUSHER; 1985-08-01 to 1990-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Herbert B  Tindall → N & R BUNN CRUSHER; 1985-08-01 to 1990-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Herbert B  Tindall → Herbert Tindall Construction; 1985-08-01 to 1990-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Nancy & Roy Bunn → N & R BUNN CRUSHER; 1990-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nancy  Bunn  et al → N & R BUNN CRUSHER; 1990-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nancy  Bunn  et al → Nancy & Roy Bunn; 1990-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Bunn  et al → Nancy & Roy Bunn; 1990-04-02 to current/open; source msha-controller-operator-history