Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of ambassadors of the United States to Germany
Table title:
Heads of the U.S. Embassy at Bonn (1955–1999)
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Name and Title </th><th colspan=1 rowspan=1 > Image </th><th colspan=1 rowspan=1 > Presentation of Credentials </th><th colspan=1 rowspan=1 > Termination of Mission </th></tr>
<tr> <td colspan=1 rowspan=1 > James B. Conant, Ambassador </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > May 14, 1955 </td><td colspan=1 rowspan=1 > February 19, 1957 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > David K. E. Bruce, Ambassador </td><td colspan=1 rowspan=1 > - </td><td class="highlighted"  colspan=1 rowspan=1 > April 17, 1957 </td><td class="highlighted"  colspan=1 rowspan=1 > October 29, 1959 </td></tr>
<tr> <td colspan=1 rowspan=1 > Walter C. Dowling, Ambassador </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > December 3, 1959 </td><td colspan=1 rowspan=1 > April 21, 1963 </td></tr>
<tr> <td colspan=1 rowspan=1 > George C. McGhee, Ambassador </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > May 18, 1963 </td><td colspan=1 rowspan=1 > May 21, 1968 </td></tr>
<tr> <td colspan=1 rowspan=1 > Henry Cabot Lodge, Jr., Ambassador </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > May 27, 1968 </td><td colspan=1 rowspan=1 > January 14, 1969 </td></tr>
<tr> <td colspan=1 rowspan=1 > Kenneth Rush, Ambassador </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > July 22, 1969 </td><td colspan=1 rowspan=1 > February 20, 1972 </td></tr>
<tr> <td colspan=1 rowspan=1 > Martin J. Hillenbrand, Ambassador </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > June 27, 1972 </td><td colspan=1 rowspan=1 > October 18, 1976 </td></tr>
<tr> <td colspan=1 rowspan=1 > Walter J. Stoessel, Jr., Ambassador </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > October 27, 1976 </td><td colspan=1 rowspan=1 > January 5, 1981 </td></tr>
<tr> <td colspan=1 rowspan=1 > Arthur F. Burns, Ambassador </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > June 30, 1981 </td><td colspan=1 rowspan=1 > May 16, 1985 </td></tr>
<tr> <td colspan=1 rowspan=1 > Richard R. Burt, Ambassador </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > September 16, 1985 </td><td colspan=1 rowspan=1 > February 17, 1989 </td></tr>
<tr> <td colspan=1 rowspan=1 > Vernon A. Walters, Ambassador </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > April 24, 1989 </td><td colspan=1 rowspan=1 > August 18, 1991 </td></tr>
<tr> <td colspan=1 rowspan=1 > Robert Michael Kimmitt, Ambassador </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > September 5, 1991 </td><td colspan=1 rowspan=1 > August 28, 1993 </td></tr>
<tr> <td colspan=1 rowspan=1 > Richard Holbrooke, Ambassador </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > October 19, 1993 </td><td colspan=1 rowspan=1 > September 12, 1994 </td></tr>
<tr> <td colspan=1 rowspan=1 > Charles E. Redman, Ambassador </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > October 31, 1994 </td><td colspan=1 rowspan=1 > June 17, 1996 </td></tr>
<tr> <td colspan=1 rowspan=1 > James D. Bindenagel, Chargé d'Affaires </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > June 17, 1996 </td><td colspan=1 rowspan=1 > September 10, 1997 </td></tr>
<tr> <td colspan=1 rowspan=1 > John C. Kornblum, Ambassador </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > September 10, 1997 </td><td colspan=1 rowspan=1 > July 7, 1999 </td></tr>
</table>
Question:
When did David K. E. Bruce serve as the United States Ambassador to Germany?
Answer:
David K. E. Bruce served as the United States Ambassador to Germany from 1957 to 1959.