# Relationship history for MSHA mine 0900282

Current hierarchy: **John A  Curtis; John L  Curtis → L C Curtis & Son Inc → Watkinsville**

- 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:** L C Curtis & Son Inc → Watkinsville; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John L  Curtis et al → Watkinsville; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L  Curtis et al → L C Curtis & Son Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John A  Curtis et al → L C Curtis & Son Inc; 1950-01-01 to current/open; source msha-controller-operator-history