# Relationship history for MSHA mine 1700985

Current hierarchy: **Ronald L  Farrin; Reginald G  Cobb; Kerry R  Farrin → Farrin Bros & Smith Inc. → Athens Pit**

- 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:** Bruce  Farrin → Athens Pit; 1981-04-01 to 2016-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Kerry R  Farrin et al → Athens Pit; 2016-07-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Farrin Bros & Smith Inc. → Athens Pit; 2016-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kerry R  Farrin et al → Farrin Bros & Smith Inc.; 2016-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald L  Farrin et al → Farrin Bros & Smith Inc.; 2016-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reginald G  Cobb et al → Farrin Bros & Smith Inc.; 2016-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Farrin → Farrin Bros & Smith Inc.; 2016-07-11 to 2016-07-05; source msha-controller-operator-history