# Relationship history for MSHA mine 3606106

Current hierarchy: **Laverne  Billings → R C Billings Inc → Kilmer 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:** Tri-Lakes Construction Inc → Kilmer Pit; 1950-01-01 to 1985-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Collins Boyd Jr-John B Kilmer → Kilmer Pit; 1950-01-01 to 1985-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Collins Boyd Jr-John B Kilmer → Tri-Lakes Construction Inc; 1950-01-01 to 1985-05-15; source msha-controller-operator-history
- **operator_operates_mine:** R C Billings Inc → Kilmer Pit; 1985-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Laverne  Billings → Kilmer Pit; 1985-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laverne  Billings → R C Billings Inc; 1985-05-16 to current/open; source msha-controller-operator-history