# Relationship history for MSHA mine 2402521

Current hierarchy: **Mike R  Griffith; Jon  Griffith → Griffith Excavating Inc → Griffith Excavating, Inc.**

- 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:** Griffith Excavating Inc → Griffith Excavating, Inc.; 2008-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth W  Griffith  et al → Griffith Excavating, Inc.; 2008-07-07 to 2020-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth W  Griffith  et al → Griffith Excavating Inc; 2008-07-07 to 2020-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Mike R  Griffith  et al → Griffith Excavating Inc; 2008-07-07 to 2020-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Mike R  Griffith et al → Griffith Excavating, Inc.; 2020-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike R  Griffith et al → Griffith Excavating Inc; 2020-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jon  Griffith et al → Griffith Excavating Inc; 2020-03-30 to current/open; source msha-controller-operator-history