20. Models. - (1) Models or samples shall be furnished only when required by the Controller. (2) Except as permitted by the Controller, no model shall exceed twelve inches on its longest side. (3) Samples shall be enclosed in convenient containers. (4) Dangerous substances shall be supplied only in accordance with the directions of the Controller. (5) Every model or sample shall be clearly and securely labelled or marked so as to identify the application to which it relates.
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