Hitachi, Ltd.

Hitachi Maxell, Limited

Yoshiharu Honma

Toshikazu Narahara

Fumio Nakano

Seikichi Tanno

Shigeki Komatsuzaki

Mitsuyoshi Shoji

Takao Uematsu

Moriichi Sato

Ren Ito

Tomio Yoshida

Jun Matsubayashi

Etsuo Oe

Ran Ito

Koo Honjoo

Mitsutoshi Shoji

A magnetic recording medium of high durability comprising a substrate material and a magnetic layer provided on at least one surface of the substrate material, the magnetic layer comprising magnetic powder and a resinous binder, characterized in that the magnetic layer comprises further at least one compound of the formula:

Magnetic recording medium

A friction material made of a molded cork, a friction surface of which is covered with a liquid or semi-solid lubricant layer including a solid lubricant layer comprising a solid lubricant having a larger particle size and a solid lubricant having a smaller particle size and filling vacant spaces between the larger-sized solid lubricant in dense form, affords a long service life when used in a power controlling apparatus which can transmit power and/or change rotation speed by applying friction and using a friction material.

Power controlling apparatus using friction material

A stabilized absorption composition comprising (a) a halogenated hydrocarbon refrigerant, (b) a liquid absorbent of a polyethylene glycol methyl ether and (c) at least one stabilizer selected from phosphite esters, epoxy compounds and organotin compounds is excellent in stability and can be used for an absorption type refrigerator for a long period of time without causing corrosion.

Liquid absorbent for absorption type refrigerator

Growing community of inventors

Hitachi, Japan

Yoshiharu Honma