Abstract: Right angular corners of knock-down reusable multipanel containers are releasably joined in assembled relationship by metal reinforcing plates and right angular spring clips which span the corners. Formed terminals on the clip arms are received by apertures of the reinforcing plates. One such aperture is relatively large to receive a release implement and the adjacent clip terminal is slotted to receive the release implement after insertion thereof through the aperture. The aperture of the other reinforcing plate is relatively narrow to prevent dangerous separation of the clip from the container following the release of one arm thereof by means of said implement.

Abstract: A knock-down reusable shipping container includes completely separable top, base, end and side walls and fastener means whereby adjoining corners of the separable walls may be securely fastened in assembled relationship and quickly separated. Spring clip fasteners cooperate with reinforcing plates on the respective container walls to produce one way and two way corner connections. Economy of manufacture and minimized labor in the use of the invention are featured.

Abstract: A concrete construction form embodies separable panels each equipped with attached longitudinal metal frame members and plural transverse braces. Four identical panels with the attached metal components are assembled to form a self-squaring column form which is reusable indefinitely after separation of the panels. The form is secured in the assembled state by a plurality of easily detachable spring steel assembly clips applied to the transverse braces at the four corners of the form. Strength, tightness and a reduction of labor are prime features.