# Relationship history for MSHA mine 3600795

Current hierarchy: **Elmer K  Fisher → Welsh Mountain Building Stone Inc → WELSH MOUNTAIN BUILDING STONE, INC.**

- 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:** Caln Building Stone Corp → WELSH MOUNTAIN BUILDING STONE, INC.; 1950-01-01 to 1980-09-15; source msha-controller-operator-history
- **controller_controls_mine:** Earl E  Rarick → WELSH MOUNTAIN BUILDING STONE, INC.; 1950-01-01 to 1980-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Earl E  Rarick → Caln Building Stone Corp; 1950-01-01 to 1980-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Welsh Mountain Building Stone Inc → WELSH MOUNTAIN BUILDING STONE, INC.; 1980-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elmer K  Fisher → WELSH MOUNTAIN BUILDING STONE, INC.; 1980-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elmer K  Fisher → Welsh Mountain Building Stone Inc; 1980-09-16 to current/open; source msha-controller-operator-history