# Relationship history for MSHA mine 0404960

Current hierarchy: **Richard J  Stimpel → Stimpel Wiebelhaus Associates → MOUNTAIN GATE LIMESTONE QUARRY**

- 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:** Mountain Gate Limestone Quarry Inc → MOUNTAIN GATE LIMESTONE QUARRY; 1988-08-01 to 2001-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Marshall  Worley  et al → MOUNTAIN GATE LIMESTONE QUARRY; 1988-08-01 to 2001-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Marshall  Worley  et al → Mountain Gate Limestone Quarry Inc; 1988-08-01 to 2001-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Stimpel Wiebelhaus Associates → MOUNTAIN GATE LIMESTONE QUARRY; 2001-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard J  Stimpel → MOUNTAIN GATE LIMESTONE QUARRY; 2001-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard J  Stimpel → Stimpel Wiebelhaus Associates; 2001-07-01 to current/open; source msha-controller-operator-history