# Relationship history for MSHA mine 1601280

Current hierarchy: **Frank G.  Sullivan Jr. → F G Sullivan Jr Contractor → Cone Crusher #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** F G Sullivan Jr Contractor → Cone Crusher #1; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank G.  Sullivan Jr. → Cone Crusher #1; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank G.  Sullivan Jr. → F G Sullivan Jr Contractor; 1994-09-01 to current/open; source msha-controller-operator-history