# Relationship history for MSHA mine 4201921

Current hierarchy: **John  Hawley; Randa  Hawley → HAWLEY ROCK PRODUCTS, INC. → NUMBER 1 PORTABLE CRUSHER**

- 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

- **controller_controls_mine:** John C  Hawley → NUMBER 1 PORTABLE CRUSHER; 1984-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** John C Hawley Company → NUMBER 1 PORTABLE CRUSHER; 1985-02-01 to 2020-04-28; source msha-controller-operator-history
- **controller_controls_operator:** John C  Hawley → John C Hawley Company; 1985-02-01 to 2020-04-28; source msha-controller-operator-history
- **controller_controls_mine:** John C  Hawley → NUMBER 1 PORTABLE CRUSHER; 2006-04-03 to 2020-04-28; source msha-controller-operator-history
- **operator_operates_mine:** HAWLEY ROCK PRODUCTS, INC. → NUMBER 1 PORTABLE CRUSHER; 2020-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randa  Hawley et al → NUMBER 1 PORTABLE CRUSHER; 2020-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randa  Hawley et al → HAWLEY ROCK PRODUCTS, INC.; 2020-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Hawley et al → HAWLEY ROCK PRODUCTS, INC.; 2020-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John C  Hawley → HAWLEY ROCK PRODUCTS, INC.; 2020-04-29 to 2020-04-28; source msha-controller-operator-history