# Relationship history for MSHA mine 0503803

Current hierarchy: **R W  Busse → R W Busse Excavating → R.W. BUSSE 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:** R W Busse Excavating → R.W. BUSSE PIT; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** R W  Busse → R.W. BUSSE PIT; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R W  Busse → R W Busse Excavating; 1982-08-01 to current/open; source msha-controller-operator-history