# Relationship history for MSHA mine 1901316

Current hierarchy: **Timothy Carlton Briggs; Dale C Briggs; Laura A Briggs → C F Briggs Inc. → CF Briggs**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** C F Briggs Inc. → CF Briggs; 2023-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy Carlton Briggs et al → CF Briggs; 2023-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy Carlton Briggs et al → C F Briggs Inc.; 2023-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laura A Briggs et al → C F Briggs Inc.; 2023-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dale C Briggs et al → C F Briggs Inc.; 2023-01-09 to current/open; source msha-controller-operator-history