Identification of gemstones by relative reflectance measurements

Details Identification of gemstones by relative reflectance measurements Identification of gemstones by relative reflectance measurements

1977-05-05

1978-09-19

Moore, Richard E.

Closure fasteners

Wedges

E05C 1900

Patent

active

041149360

ABSTRACT:
A device for limiting the unauthorized opening of a door comprising two elongated channel members that are pivotally attached to each other at one of the ends thereof so that they may be expanded to form a wedge which will limit the opening of the door. The bottom one of the members is attached to the floor, side wall or ceiling adjacent to the door and it is also provided with a prop that is pivotally attached thereto and located thereon so that when the prop is erected it supports one of the members tilted with respect to the other member; that latter member is provided with a screw threaded thereto to engage the top portion of the prop and hold the prop upright whereby the members are retained in the wedge shape until the screw is released.

REFERENCES:
patent: 1042329 (1912-10-01), Daniels
patent: 1338205 (1920-04-01), Albright
patent: 1633202 (1927-06-01), Williams

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