Abstract: An electric motor includes a cylindrical metal casing 2, a stator 3 accommodating in the casing, and a metal spacer 10 interposed between the casing and the stator.

Abstract: A copolymer having repeating units of the following formula (I) and repeating units of the formula (II), wherein the ration of (I) to (II) is within a range of from 10:90 to 90:10 by weight ratio, and the number average molecular weight is at least 1,000, or the intrinsic viscosity .eta..sub.inh is at least 0.02: ##STR1## wherein A is a polyester unit having a polymerization degree of from 2 to 200, R.sup.3 is a bivalent organic group having an ester, urethane or ketone bond, and R.sup.4 is a hydrogen atom or a methyl group, ##STR2## wherein R.sup.5 is a hydrogen atom or a methyl group, and X is a substituent having functionality.

Abstract: A laser welding method and apparatus for welding stacked coated members in which voids in the welds are positively eliminated. A spacer is disposed between the two members to be welded. This provides a path for discharging gas formed by heating the coating material. The method and apparatus of the invention are useful for the laser welding of base members coated with metals having a lower melting point than the metal of the base, paints and oils. Preferably, the width of the gap is in a range of 0.1 mm to 0.5 mm.

Abstract: A propylene-ethylene block copolymer in the presence of a catalyst comprises as main components, a solid titanium-containing catalytic component and an organoaluminum compound having the formulaAIR.sub.m.sup.1 Cl.sub.3-m(R.sup.1 represents a C.sub.1-20 hydrocarbon moiety; and m is 3.gtoreq.m>1.5) by producing a homopolymer of propylene or a propylene-ethylene copolymer by polymerizing propylene or both propylene and ethylene at a vapor phase propylene concentration of 90 mol % or higher based on the sum of propylene and ethylene in a first step and producing a propylene-ethylene block copolymer by copolymerizing propylene and ethylene at a vapor phase propylene concentration of less than 90 mol % based on the sum of propylene and ethylene in the presence of the polymer resulted in the first step and the catalyst in a second step is produced by newly adding an aluminum compound having the formulaAlR.sub.n.sup.2 X.sub.3-n(R.sup.2 represents a C.sub.