# Relationship history for MSHA mine 0503769

Current hierarchy: **Knisley Lyle E & Edward L → Rocky Mountain Minerals → Rocky Mountain Minerals**

- 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:** Lyle E Knisley → Rocky Mountain Minerals; 1982-04-01 to 1985-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Knisley Lyle E & Edward L → Rocky Mountain Minerals; 1982-04-01 to 1985-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Knisley Lyle E & Edward L → Lyle E Knisley; 1982-04-01 to 1985-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Strategic Earth Resources Corp → Rocky Mountain Minerals; 1985-05-31 to 1987-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Knisley Daniel L → Rocky Mountain Minerals; 1985-05-31 to 1987-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Knisley Daniel L → Strategic Earth Resources Corp; 1985-05-31 to 1987-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Mountain Minerals → Rocky Mountain Minerals; 1987-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Knisley Lyle E & Edward L → Rocky Mountain Minerals; 1987-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knisley Lyle E & Edward L → Rocky Mountain Minerals; 1987-04-06 to current/open; source msha-controller-operator-history