# Relationship history for MSHA mine 4104977

Current hierarchy: **Humberto  Fraire → JRB MATERIALS AND CONSTRUCTION, INC → SPUR 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

- **controller_controls_mine:** Humberto  Fraire → SPUR PIT; 2012-05-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** JRB MATERIALS AND CONSTRUCTION, INC → SPUR PIT; 2012-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Humberto  Fraire → JRB MATERIALS AND CONSTRUCTION, INC; 2012-12-04 to current/open; source msha-controller-operator-history