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Codes and Frequencies



An 'X' indicates the category is available for that sample

00NIUXXXXXXXXXXXXXXXX····
10No or not known to be usedXXXXXXXXXXXXXXX·XXXX
20YesXXXXXXXXXXXXXXX·XXXX
21Manual only···············X····
22Manual and electric···············X····
23Electric only···············X····
97Unknown-refused·····XX·······X·····
98Unknown-not ascertained·····XXX·X··X·X·····
99Unknown-don't know·······X······X·····