# Relationship history for MSHA mine 1101612

Current hierarchy: **Stenstrom Companies Ltd → Stenstrom Sand & Gravel Group → Stenstrom Sand & Gravel Group**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Lobdell Redi-Mix → Stenstrom Sand & Gravel Group; 1981-05-01 to 1995-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Sheldon  Lobdell → Stenstrom Sand & Gravel Group; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sheldon  Lobdell → Lobdell Redi-Mix; 1981-05-01 to 1995-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Stenstrom Sand & Gravel Group → Stenstrom Sand & Gravel Group; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stenstrom Companies Ltd → Stenstrom Sand & Gravel Group; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stenstrom Companies Ltd → Stenstrom Sand & Gravel Group; 1995-05-01 to current/open; source msha-controller-operator-history