In the case of a multiple gear gearbox the loose gear of one of two immediately adjacent permanently engaged gear pairs is supported on the axially extended hub of the loose gear of the other gear pair and carries its shift dogs on the end face remote from the latter loose gear. Its shift dogs are arranged on the free end of the extended hub. In order to permit the transmission of high torques by means of a simple design with few components a small overall axial length and high reliability an ax...

Processes and intermediates useful in the preparation of bronchodilator compounds of the formula ##STR1## wherein R is hydrogen methyl or hydroxymethyl are described. Those compounds wherein R is H or CH.sub.3 have been found to have further utility as intermediates for pirbuterol (wherein R is hydroxymethyl).