# Relationship history for MSHA mine 0504554

Current hierarchy: **Timothy  DeHerrera; Todd A  Stockebrand; Brittney  DeHerrera; Robert  St → Asphalt Constructors Inc → Portable Crusher #1**

- 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:** Todd A  Stockebrand  et al → Portable Crusher #1; 1991-05-01 to 2018-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Asphalt Constructors Inc → Portable Crusher #1; 1995-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd A  Stockebrand  et al → Asphalt Constructors Inc; 1995-01-01 to 2018-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Allen W  King  et al → Asphalt Constructors Inc; 1995-01-01 to 2018-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Brittney  DeHerrera et al → Portable Crusher #1; 2018-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brittney  DeHerrera et al → Asphalt Constructors Inc; 2018-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd A  Stockebrand et al → Asphalt Constructors Inc; 2018-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Stockebrand et al → Asphalt Constructors Inc; 2018-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  DeHerrera et al → Asphalt Constructors Inc; 2018-12-12 to current/open; source msha-controller-operator-history