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in creator/contributor: "Diehl, Frederick"  
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Trailer.

Description: Patent for improved construction and arrangement of trailers. This improvement will allow an easy turning movement where a number of trailers are connected while admitting of strain between the various trailers when they are turning a corner or going around a curve.
Date: August 20, 1918
Creator: Watkins, Leigh
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Trailer.

Description: Patent for "...an improved construction and arrangement of trailers and has for an object that provision of means which will allow as easy turning movement where a number of trailers are connected while admitting of strain between the various trailers, whereby they are propelled properly around a curve." (lines 5-15) including illustrations.
Date: August 28, 1917
Creator: Watkins, Leigh
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Automatic Train Stop

Description: Patent for an automatic train stop. Used to simplify the construction where fewer magnets and changeable switches are necessary. To provide an automatic train control mechanism with a normally closed circuit, the breakage or disarrangement of any part that would ensure the stopping of the train.
Date: May 21, 1918
Creator: Bulla, Melbern B.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Magneto-Contact.

Description: Patent for magneto contacts, designed for easy removal, cleaning, and replacement, without short circuits, featuring novel construction features and parts arrangements.
Date: April 26, 1921
Creator: Rigsby, Virgi
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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