# Relationship history for MSHA mine 3800544

Current hierarchy: **Larry  Herndon → Colleton Sand Plant → Colleton Sand Plant**

- 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:** Philipp Holzmann A G → Colleton Sand Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rea Construction Company → Colleton Sand Plant; 1979-01-01 to 1979-02-06; source msha-controller-operator-history
- **controller_controls_operator:** Philipp Holzmann A G → Rea Construction Company; 1979-01-01 to 1979-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Walker Enterprises Of Walterboro Inc → Colleton Sand Plant; 1979-02-07 to 2002-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Walker Kenneth R → Colleton Sand Plant; 1979-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walker Kenneth R → Walker Enterprises Of Walterboro Inc; 1979-02-07 to 2002-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Lowcountry Sand & Gravel, Inc. → Colleton Sand Plant; 2002-08-29 to 2003-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Roger W  Walker → Colleton Sand Plant; 2002-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger W  Walker → Lowcountry Sand & Gravel, Inc.; 2002-08-29 to 2003-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Lowcountry Concrete of Ridgeland Inc → Colleton Sand Plant; 2003-06-01 to 2007-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Herndon et al → Colleton Sand Plant; 2003-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Herndon et al → Lowcountry Concrete of Ridgeland Inc; 2003-06-01 to 2007-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Colleton Sand Plant → Colleton Sand Plant; 2007-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Herndon et al → Colleton Sand Plant; 2007-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Herndon et al → Colleton Sand Plant; 2007-10-09 to current/open; source msha-controller-operator-history