# Relationship history for MSHA mine 0100719

Current hierarchy: **James  Campbell → Campbell Sand & Gravel Company → GILMORE 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

- **operator_operates_mine:** Campbell Sand & Gravel Company → GILMORE PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Campbell → GILMORE PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Campbell → Campbell Sand & Gravel Company; 1950-01-01 to current/open; source msha-controller-operator-history