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1. (WO2013156985) CEILING PLANK
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What is claimed is:

1. A ceiling plank assembly comprising,

a) at least two elongated generally rectangular wood composition or plastic composition ceiling plank members having a predetermined thickness that provides the elongated ceiling plank members with a predetermined resilient flexibility to facilitate installation of the elongated ceiling plank members on a ceiling,

b) each said elongated ceiling plank member having two opposite elongated side edges and two opposite end edges, and the length of said elongated side edges is between 9 and 10 times the width of the opposite end edges,

c) one of the elongated side edges and one of the end edges of each said elongated ceiling plank member being formed with a groove-like engagement profile including spaced sidewalls and a channel, and the other of the elongated side edges and the other of the end edges of each said elongated ceiling plank member being formed with a complementary tongue-like engagement profile, to permit tongue and groove interengagement of the two of said elongated ceiling plank members in side-by side or end-to-end engagement, and

d) a metallic ceiling plank securement clip for securement of one of said elongated plank members to a ceiling, said ceiling clip having a base and means for securement of the base of said ceiling clip to a ceiling, and said ceiling clip further including a holding prong projecting from the base for accommodation in the channel of the groove-like engagement profile to engage against one of the channel sidewalls of the groove-like engagement profile at the one elongated side edge of one of the elongated ceiling plank members to secure said one elongated ceiling plank member to a ceiling and permit inter-engagement of the tongue-like engagement profile at the other elongated side edge or at the other end edge of the other said elongated ceiling plank member in side-by-side or end-to-end engagement with the one elongated ceiling plank member.

2. The ceiling plank assembly as claimed in claim 1 further including a third ceiling plank member having one end that is a cut end with no tonguelike or groove-like engagement profile, and having opposite sides that include the respective tongue-like and groove-like engagement profiles, and having an opposite end that includes one of the tongue-like and groove-like engagement profiles, and wherein the cut end is unengaged with any other ceiling plank member in the ceiling plank assembly and the opposite end and the opposite sides of the third ceiling plank member are interengagable with the complementary engagement profiles of other said ceiling plank members in side-by-side and end-to-end engagement.

3. The ceiling plank assembly as claimed in claim 1 wherein the ceilmg plank members have a display surface with a peripheral edge and the peripheral edge is beveled.

4. The ceiling plank assembly as claimed in claim 1 wherein the core of the ceiling plank members is fire retardant class A hardboard.

5. A method of installing a ceiling plank assembly comprising, a) providing at least two elongated generally rectangular wood composition or plastic composition ceiling plank members with a

predetermined thickness that renders the elongated ceiling plank members with a predetermined resilient flexibility to facilitate installation of the elongated ceiling plank members on a ceiling,

b) providing each said elongated ceiling plank member with two opposite elongated side edges and two opposite end edges,

c) forming the full length of each of the side edges and each of the end edges with complementary interengaging joining means for joining the two elongated plank members in side-by-side or end-to-end engagement, d) limiting the full length of said elongated side edges to between 9 and 10 times the width of the opposite end edges,

e) providing one of the elongated side edges and one of end edges of each of the elongated ceiling plank members with a groove-like engagement profile including spaced sidewalls and a channel, and providing the other of the elongated side edges and the other of the end edges of each of the elongated ceiling plank members with a complementary tongue-like engagement profile, to permit tongue and groove interengagement of the two elongated ceiling plank members in side-by-side or end-to-end engagement, f) securing a metallic ceiling plank securement clip to a ceiling by providing the ceiling clip with a base and means for securing the base to a ceiling,

g) using the ceiling clip that is secured to a ceiling to hold a grooved side edge of one of the ceiling plank members against the ceiling by further providing the ceiling clip with a holding prong projecting from the base for accommodation in the channel of the groove-like engagement profile at the side of the one ceiling plank member to sandwich one of the channel sidewalls between the holding prong and the ceiling, and

h) joining the other elongated ceiling plank member in side-by-side or end-to-end engagement with the one elongated ceiling plank member by interengaging the tongue-like engagement profile at the side or end of the other ceiling plank member with the side or end of the one ceiling plank member.

6. The method of claim 5 including providing a third ceiling plank member with a cut end having no tongue-like or groove-like engagement profile, and the opposite sides are provided with respective tongue and groove-like engagement profiles, and the opposite end is provided with one of the tongue-like and groove-like engagement profiles, and locating the third ceiling plank member such that the cut end is unengaged with any other ceiling plank member in the ceiling plank assembly and the opposite end and opposite sides of the third ceiling plank member are engageable with the complementary engagement profiles of the other said ceiling plank members in side-by-side and end-to-end engagement.

7. The method of claim 5 including providing the ceiling plank members with a display surface having a peripheral edge and beveling the peripheral edge of the display surface.

8. The method of claim 5 including forming the core of the ceiling plank members with fire retardant class A hardboard.