# Relationship history for MSHA mine 0405070

Current hierarchy: **Daryl  Dickerson → PYRAMID CONSTRUCTION AND AGGREGATES, INC. → SHELL CANYON OCOTILLO 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Masters Const-Div/Farmers Land Leveling Inc → SHELL CANYON OCOTILLO PIT; 1990-01-01 to 2022-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Wayne T  Zills → SHELL CANYON OCOTILLO PIT; 1990-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne T  Zills → Masters Const-Div/Farmers Land Leveling Inc; 1990-01-01 to 2022-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Daryl  Dickerson → SHELL CANYON OCOTILLO PIT; 2005-09-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pyramid Construction and Aggregates, Inc. → SHELL CANYON OCOTILLO PIT; 2022-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daryl  Dickerson → Pyramid Construction and Aggregates, Inc.; 2022-03-09 to current/open; source msha-controller-operator-history