# Relationship history for MSHA mine 3002946

Current hierarchy: **George  Rifenburg; John K  Rifenburg → RIFENBURG CONSTRUCTION, INC. → ST.JOHNSVILLE PIT #2**

- 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:** Rifenburg Construction, Inc. → ST.JOHNSVILLE PIT #2; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John K  Rifenburg et al → ST.JOHNSVILLE PIT #2; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John K  Rifenburg et al → Rifenburg Construction, Inc.; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Rifenburg et al → Rifenburg Construction, Inc.; 1990-03-01 to current/open; source msha-controller-operator-history