# Relationship history for MSHA mine 0504465

Current hierarchy: **John C  Martin; Richard K  Stephenson → Roaring Fork Aggregates Inc → RIFLE 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:** John C  Martin et al → RIFLE PIT; 1985-09-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Roaring Fork Aggregates Inc → RIFLE PIT; 1991-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John C  Martin et al → Roaring Fork Aggregates Inc; 1991-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard K  Stephenson et al → Roaring Fork Aggregates Inc; 1991-08-01 to current/open; source msha-controller-operator-history