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:
Ashoknagar (Vidhan Sabha constituency)
Table title:
Members of Legislative Assembly
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Election Year </th><th colspan=1 rowspan=1 > Constituency </th><th colspan=1 rowspan=1 > Name of M.L.A. </th><th colspan=1 rowspan=1 > Party Affiliation </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1967 </td><td colspan=1 rowspan=1 > Ashoknagar </td><td class="highlighted"  colspan=1 rowspan=1 > Sadhan Kumar Sen </td><td class="highlighted"  colspan=1 rowspan=1 > Communist Party of India </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1969 </td><td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > Sadhan Kumar Sen </td><td class="highlighted"  colspan=1 rowspan=1 > Communist Party of India </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1971 </td><td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > Nani Kar </td><td class="highlighted"  colspan=1 rowspan=1 > Communist Party of India (Marxist) </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1972 </td><td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > Keshab Chandra Bhattacharya </td><td class="highlighted"  colspan=1 rowspan=1 > Independent </td></tr>
<tr> <td colspan=1 rowspan=1 > 1977 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Nani Kar </td><td colspan=1 rowspan=1 > Communist Party of India (Marxist) </td></tr>
<tr> <td colspan=1 rowspan=1 > 1982 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Nani Kar </td><td colspan=1 rowspan=1 > Communist Party of India (Marxist) </td></tr>
<tr> <td colspan=1 rowspan=1 > 1987 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Nani Kar </td><td colspan=1 rowspan=1 > Communist Party of India (Marxist) </td></tr>
<tr> <td colspan=1 rowspan=1 > 1991 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Nani Kar </td><td colspan=1 rowspan=1 > Communist Party of India (Marxist) </td></tr>
<tr> <td colspan=1 rowspan=1 > 1996 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Nirode Roy Choudhury </td><td colspan=1 rowspan=1 > Communist Party of India (Marxist) </td></tr>
<tr> <td colspan=1 rowspan=1 > 1999 Bye Election </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Badal Bhattacharya </td><td colspan=1 rowspan=1 > Bharatiya Janata Party </td></tr>
<tr> <td colspan=1 rowspan=1 > 2001 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Sarmistha Dutta </td><td colspan=1 rowspan=1 > Communist Party of India (Marxist) </td></tr>
<tr> <td colspan=1 rowspan=1 > 2006 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Satyasebi Kar </td><td colspan=1 rowspan=1 > Communist Party of India (Marxist) </td></tr>
<tr> <td colspan=1 rowspan=1 > 2011 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Dhiman Roy </td><td colspan=1 rowspan=1 > All India Trinamool Congress </td></tr>
</table>
Question:
Who are members of legislative assembly before 1975?
Answer:
Keshab Chandra Bhattacharya of Independent, won in 1972, Nani Kar of Communist Party of India won in 1971, and Sadhan Kumar Sen of Communist Party of India won in 1969 and 1967.