NIXON'S AIDE SAYS ADDITIONAL TAPES HAVE BLANK SPOTS
White House atty J F Buzhardt Jr testifies on Nov 28 in Fed Dist Ct that there are 'number' of blank sections lasting several mins each on subpoenaed White House tape recordings; terms this disclosure unimportant; says existence of 'spots' is not particularly 'surprising' because machinery was sound-actuated and thus could be actuated by sounds such as machine as well as by conversation; White House counsel L Garment tells Judge Sirica that existence of blank sections is 'collateral' matter and that its significance will have to be determined by technical experts; White House press office says 'spaces' described by Buzhardt are simply blank spaces rather than 'gaps' in which parts of conversations were obliterated; prosecutor R Ben-Veniste is skeptical; Buzhardt says he was told by White House technical expert H Rosenblum 'of NSA' that there was 'remote' possibility that material originally recorded on 18-min segment that was obliterated could in some way be 'brought out'; Buzhardt says he recd last Aug 13 same document that, he insists, led him to conclude on Nov 14, for 1st time, that prosecution subpoena covered tape in which 18-min gap occurs; says 'close reading' of prosecution memo describing 9 conversations specified in subpoena had led him to realize that June 20 '72 Nixon-Haldeman conversation was covered; says, in reply to question, that it is true that there are 'substantial periods lasting several mins in which meter registered no sound'
