<Tr> <Td> 29 </Td> <Td> Seattle, Washington </Td> <Td> Sept. / Oct. 1970 </Td> </Tr> <Tr> <Td> 30 </Td> <Td> Kansas City, Missouri </Td> <Td> September 1974 </Td> </Tr> <Tr> <Td> 31 </Td> <Td> Atlantic City, New Jersey </Td> <Td> October 1978 </Td> </Tr> <Tr> <Td> 32 </Td> <Td> Los Angeles, California </Td> <Td> September 1982 </Td> </Tr>

Which type of labor union is the international brotherhood of electrical workers (ibew)